Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a3b2fe6f670b1b…

MALICIOUS

PDF

98.0 KB Created: 2021-03-27 22:41:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 245e2c101c4f901156f1358aaf434c80 SHA-1: e9153c26115892eda169462204ee8fb7b492d8d2 SHA-256: c3a3b2fe6f670b1bb6f5e4a2c7b972a17b1f78a4a8d1b24d92bcf4ab2c5df7bc
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly suggests maliciousness. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/aws?utm_term=how+to+find+the+mean+median+mode+and+standard+deviation PDF link annotation
    • http://zizodoroluxonaf.sportsontheweb.net/how_to_write_an_outline_for_a_novel.pdfIn PDF document text
    • http://reactivascotia2020.com/97294992499sqfnx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497395/normal_60086b8f485a9.pdfIn PDF document text
    • http://pop-marketplace.ru/jofenlvdni.pdfIn PDF document text
    • http://vimobewawulipiz.mypressonline.com/47469315396.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378619/normal_5fe188de03273.pdfIn PDF document text
    • http://lnstagramverifycentre.com/zixobodimanlr3h4.pdfIn PDF document text
    • http://realwockyc.info/29826688524dc9cr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485305/normal_603360609cd07.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c779a0a5-5a96-4308-8c37-720837e0bdd2.filesusr.com/ugd/4f1d02_3e4e1ae2c37448e9be1f539eac025196.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0445c5d-ed9f-47b0-8d04-d0d110344be6/family_tree_chart_template_google_docs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caf5be69-8edd-4fa6-905a-f4ec748b2d3a/31062078930.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b0a2515-11d0-414c-9ef2-07c5dea1f98e/how_to_manually_light_char_broil_infrared_grill.pdfIn PDF document text
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_7557d630818f41e2a926ad5622e4a6b0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/595ff440-ca19-4e03-8120-f7559661f1f5/simple_recipes_for_fussy_eaters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dda6798f-3b29-4819-90e8-2ae209d5519a/taco_bell_shredded_chicken_quesarito_nutrition.pdfIn PDF document text
    • https://eeeff038-21f9-42a6-bde0-cd945221d618.filesusr.com/ugd/9dc459_bac44ea421b646a0b5995506201d97dd.pdf?index=trueIn PDF document text
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_1a29404dfd214df49b90d4faf6485f12.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ddde40f-b710-48aa-97b7-b3ed52b9e72e/57946815281.pdfIn 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 PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF6 5228 bytes
SHA-256: 008c2f9893050cbd800ff69475b3e2addf905794349f927a81b5b237ce66357b
font_01_sfnt_off00014fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FA6 12564 bytes
SHA-256: 4f4803701d3024eaadef26b60266e38e59dfe8738e854a2d41c78819387e90bb