Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ecf35bb7dc47df2…

MALICIOUS

PDF

74.2 KB Created: 2021-02-22 04:42:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2b159f19fe5847b94d98e869580c4d8 SHA-1: 4c8ad003a2d916408e71b665a4b6e565e4d384b9 SHA-256: 4ecf35bb7dc47df2981589d6af47fc0e06903b41fd5153e27356b1c157fe1072
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF document is classified as malicious, exhibiting characteristics of both advance-fee scams and callback phishing lures. It contains a large number of external links, many of which point to SEO-optimized PDF documents, suggesting a link farm or SEO poisoning attempt. The document body, though heavily obfuscated, appears to reference policy manuals and benefit information, aligning with advance-fee fraud schemes. The presence of embedded URLs and the ML classifier's high confidence score further support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://jacksth.ru/wix?keyword=medicare+benefit+policy+manual+chapter+9+section+90
    • https://liduwofixuxobef.weebly.com/uploads/1/3/0/7/130739348/lanopuxodoj_powigo_kivuxubaseloxul.pdf
    • https://giminabev.weebly.com/uploads/1/3/4/6/134601645/givexanigukiratujok.pdf
    • https://gefawopunov.weebly.com/uploads/1/3/0/9/130969454/subesibevusib_zamoxe.pdf
    • https://bowutemol.weebly.com/uploads/1/3/4/2/134234741/fexilonug_zabexa.pdf
    • https://cdn-cms.f-static.net/uploads/4465703/normal_5fe6ddaa8fd59.pdf
    • https://static.s123-cdn-static.com/uploads/4423427/normal_6006557f65882.pdf
    • https://nomabedipami.weebly.com/uploads/1/3/1/4/131437379/1483754.pdf
    • https://static.s123-cdn-static.com/uploads/4372072/normal_5fed12999d8c4.pdf
    • https://vubufogos.weebly.com/uploads/1/3/4/7/134766152/kimeto-nezepi-lavug.pdf
    • https://cdn-cms.f-static.net/uploads/4402504/normal_601f2721535fb.pdf
    • https://cdn-cms.f-static.net/uploads/4463034/normal_60313f429bd4f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://dopodisimedu.epizy.com/chaparral_pro_semibold_italic_font_free.pdf
    • https://s3.amazonaws.com/mufukep/19420346165.pdf
    • http://xefavab.rf.gd/how_are_sedimentary_rocks_formed_worksheet.pdf
    • https://s3.amazonaws.com/xeponodij/65731371524.pdf
    • https://s3.amazonaws.com/xipavir/eve_online_starter_guide_2019.pdf
    • https://s3.amazonaws.com/mupukesunobaga/walmart_getting_rid_of_cashiers_2019.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d653.bin
becdfed39b3ebbd27fe5a70469820a2fe40fe65c48355999500d3439ec0cdd6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD653 5820 bytes
font_01_sfnt_off0000e9ec.bin
6cf6762f3e171ccaedcd2f8145e8f77192fe5b05c86fbb238d69a705ea5496ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EC 10308 bytes
font_02_sfnt_off00010d43.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D43 4324 bytes

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