Malicious PDF — malware analysis report

Static analysis result for SHA-256 35f8446da5bdf2d3…

MALICIOUS

PDF

94.0 KB Created: 2021-05-18 12:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 18c971183730b627fd74bc800fe269eb SHA-1: ab0fda5840d1cdb863e16b33117c87e131522992 SHA-256: 35f8446da5bdf2d3363256f7bc9af556d8daa61f7bcde3216fadd59425c7d244
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains a link farm pointing to numerous external PDFs hosted on disposable domains, suggesting a phishing or SEO spam campaign. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely related to distributing further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pelibifir.ru/strik?utm_term=verben+mit+pr%25C3%25A4positionen+liste+pdf+c1 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403259/normal_5ff302a977926.pdfIn PDF document text
    • http://zefedupawomodos.22web.org/actinomicosis_pediatria.pdfIn PDF document text
    • https://faruroju.weebly.com/uploads/1/3/5/9/135986438/fawosi_rukarufe_zagiduxof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464078/normal_60570e9fcac41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405459/normal_600e9c78c6c15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388596/normal_603ab1029d21e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480187/normal_602b11c34ef9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453115/normal_5fe6d797475df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372681/normal_5fc9285d9b7a3.pdfIn PDF document text
    • https://bonuwokepav.weebly.com/uploads/1/3/4/5/134592975/zexidalaworuku-wusuwumulu-tegafemizeki.pdfIn PDF document text
    • http://tesigelilojir.iblogger.org/baixar_reader_free.pdfIn PDF document text
    • https://zolagefotatol.weebly.com/uploads/1/3/4/7/134709454/xemotazi_begaxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367927/normal_604fbbc785019.pdfIn PDF document text
    • https://dakesepev.weebly.com/uploads/1/3/4/3/134308776/7152234.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406208/normal_5fe66b9a256a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467955/normal_5fd9021809f37.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7ed92e0-03d2-4844-bace-18964ffa061a/19321467718.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0cdb61a-dc41-408a-936c-d00f03a1dd30/the_mortal_instruments_city_of_bones_graphic_novel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6b490e8-953e-4590-9d61-ecb9dc8fb8c2/16511190006.pdfIn PDF document text
    • http://xinudigiwuwa.epizy.com/honda_civic_si_2018_maintenance_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5f76385-7c1a-4967-a27e-6d2a6e67613a/96283465162.pdfIn PDF document text
    • http://xebopeveralox.epizy.com/50607802332.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/735d46d6-5ebf-4b95-8012-c5d84efa3fb5/23878563089.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8626f2a-0f90-437a-9774-ea9fb2c3e762/my_family_and_other_animals_read_online_free.pdfIn PDF document text
    • http://bolunivagoxel.epizy.com/maribokuvudage.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAC 5776 bytes
SHA-256: 5db4f2798f80cb067293fe5f5dce78a78eddcd228219d0cb258ec8e2c728cd35
font_01_sfnt_off000111f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F5 5484 bytes
SHA-256: a81d631a15e3ae4ba4ed5449e57dac63f11f4928e2500cfb6b52091ff9bb868f
font_02_sfnt_off00012485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12485 13644 bytes
SHA-256: e8b0b1f936519a5c52d35f1ba3152d3b92c8cea8ced905b94120a07e81b9eae3
font_03_sfnt_off00014e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E96 16960 bytes
SHA-256: eec04039724523a65d766a2e406b8788e7770e11a99f479d72468c69c596d14a

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