Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f2b9e7e3714334c…

MALICIOUS

PDF

80.8 KB Created: 2021-05-06 22:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 51654794e00688f9551f9bf00dc71638 SHA-1: cdaca36b86d5c2315d0a83597f3bb2549cd5631b SHA-256: 2f2b9e7e3714334c7e9b8ab70d0eb7c202bbf5dbb684bf1126333af30875a8d8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and potentially benign-looking PDF files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO spam. The embedded URLs and the PDF structure suggest an attempt to distribute or link to malicious content, possibly exploiting users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://soxebez.ru/strik?utm_term=3.4+linear+dimensions+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379744/normal_603a70488085a.pdfIn PDF document text
    • http://repuvotase.iblogger.org/2007_jeep_grand_cherokee_crd_specs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454672/normal_5ff92c5c0b556.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446511/normal_6054f4479cefd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447265/normal_601322c5047dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476566/normal_603d7e706bcb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383689/normal_601d7815a618c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449992/normal_5fec146a1ba7b.pdfIn PDF document text
    • http://wipababotuzuke.iblogger.org/79927686603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403283/normal_605b8b771add4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497071/normal_5fd3146aba30b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486535/normal_60625e27a1095.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_0256b3d642dc44a3ab92e04880169819.pdf?index=trueIn PDF document text
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_975501dccd094f0d91ac1d3d020c8ff9.pdf?index=trueIn PDF document text
    • http://zodumuf.rf.gd/lilezetofogovemefog.pdfIn PDF document text
    • http://saninov.epizy.com/xolojalal.pdfIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_ac59752b0dcc43febbfa8d709d8f7acb.pdf?index=trueIn PDF document text
    • https://ec560393-4650-4708-bf0c-d08fceb8458c.filesusr.com/ugd/ca69db_31323da5d2794e7f90a4caa863f8bb83.pdf?index=trueIn PDF document text
    • https://fa90eb46-aa9b-4fd1-a2e8-e903ec8e50a4.filesusr.com/ugd/575fb0_d8720dce0cc84c1b98a915ad7efef5fe.pdf?index=trueIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_43af06c78c654f7e8e6eeb6ebe8c075a.pdf?index=trueIn PDF document text
    • http://tesuluxabel.rf.gd/5_point_hedonic_scale_rating.pdfIn PDF document text
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_059ead90c80f4f638c9136d799b711cb.pdf?index=trueIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_f4bf4aebdaa341d4908c957f04ce3d35.pdf?index=trueIn PDF document text
    • https://77cbb24c-feae-490b-854c-0a9d4db21a85.filesusr.com/ugd/3752ea_ee37399322ad4391b62080e41b49514f.pdf?index=trueIn PDF document text
    • https://f200304d-316b-45a9-b05c-680123ec6d1a.filesusr.com/ugd/aad1a2_dd94c8145b9e4e1db71bbd89e42d95a5.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 PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE357 5252 bytes
SHA-256: 5987236180b02f64d82c609ea1d410be2b8ead6921b0fec7aed9cee04b231e71
font_01_sfnt_off0000f533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF533 10540 bytes
SHA-256: 35768630b5a84248c908749d5e9453aa1cf8059e741d4c48ba2e014eaea8c246
font_02_sfnt_off00011978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11978 18028 bytes
SHA-256: 567225f01d3e13e10797e032dba303816d3c6450e41140be0e5e4b7381fa3453

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