Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce5178757828ad1…

MALICIOUS

PDF

98.2 KB Created: 2021-03-08 02:47:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8c0b8d9594597cb9bbc6de3d27d4ffd0 SHA-1: bbb8867beb63470d173fc0bdd4c03adc57fbbce2 SHA-256: bce5178757828ad16a83d3d1bb51f5ee937250fd658313b466f54bdad42a1377
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to other PDF documents, many hosted on disposable domains. This technique is often used for SEO manipulation or to distribute further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://s3.amazonaws.com/potamotaz/43745360946.pdf In PDF document text
    • https://s3.amazonaws.com/somisilegex/99660978439.pdfIn PDF document text
    • https://leonvi.ru/wix?keyword=crash+by+jerry+spinelli+full+book+pdf+freePDF link annotation
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off0001243c.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off0001243c.bin)
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_ee49af642df044d8a13becdb880ba38a.pdf?index=trueIn PDF document text
    • http://bowegasobufur.myartsonline.com/91731324474.pdfIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_097486c0160a47749dbad0849565385f.pdf?index=trueIn PDF document text
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_cd56dec887b34b99b179f18573462962.pdf?index=trueIn PDF document text
    • https://14da0a27-f261-4d4b-8668-3a369f5c966d.filesusr.com/ugd/46429b_701630b92f8e47af897133533b07b5ee.pdf?index=trueIn PDF document text
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_2be5f270c80e41eea70d113935521230.pdf?index=trueIn PDF document text
    • https://e18e6c05-101e-4f41-9c4d-f518aea09dbb.filesusr.com/ugd/7972b3_c0336e6520034ae5be82b1d4a56a68b4.pdf?index=trueIn PDF document text
    • https://8909b315-4d59-4940-aabf-0fdaa532e0ad.filesusr.com/ugd/4542d9_6851c4f8ce7c4a808d4428f2185ebb99.pdf?index=trueIn PDF document text
    • http://dipagepe.atwebpages.com/70898564213.pdfIn PDF document text
    • https://0926596c-b1e6-4473-87d6-fed2e709bfeb.filesusr.com/ugd/e2a635_bb3f9e1435ba4c359759ce15a83e5822.pdf?index=trueIn PDF document text
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_34776569661842e1a4fb7aedcf279347.pdf?index=trueIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_32917d8605ef4ee994eab8338426252e.pdf?index=trueIn PDF document text
    • https://626fb5af-1d67-41cb-86ce-204163677ff0.filesusr.com/ugd/9d869b_c05c156782d24b9c9599497d501dfb88.pdf?index=trueIn PDF document text
    • http://kawerulim.onlinewebshop.net/how_to_get_soundbar_to_work_with_tv_volume.pdfIn PDF document text
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_f933ff4aa48f40f1993fd7753d387478.pdf?index=trueIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_42f24a58a9054298ae329358e36ae1cd.pdf?index=trueIn PDF document text
    • https://76b44699-1094-4fd8-8d4a-70b7be8159c3.filesusr.com/ugd/c450b2_51ec2975ecdc408dad0c97f7fbf44af8.pdf?index=trueIn PDF document text
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_02fc1687b583434d8c3a9d7557607668.pdf?index=trueIn PDF document text
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_6dd0b10a829749859b08b5b810bc6d95.pdf?index=trueIn PDF document text
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_cbff8e3ac9a448b4b52c1db1098d4c09.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn extracted file (font_00_sfnt_off0001243c.bin)
    • http://dejavu.sourceforge.netIn extracted file (font_02_sfnt_off000164f5.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_02_sfnt_off000164f5.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001243c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243C 5416 bytes
SHA-256: 3182fe92a4464e37744c586e1544484205a82a70c446c92874aadae66d40eee8
font_01_sfnt_off000136a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A2 14804 bytes
SHA-256: 5f8bb6e72a79650b4e6060c7a717f02f5e219617127cfddc19e126f07ec8faba
font_02_sfnt_off000164f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164F5 16384 bytes
SHA-256: b6b7f901ace08fc5bcdac8827c351b340e918a7fe51572d7bc4ba752988caa76