Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e6a7f14bf594d42…

MALICIOUS

PDF

124.9 KB Created: 2021-05-23 22:39:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79fbde4c8695c7886501a2f187aa9054 SHA-1: 87cba3cfe1875b21d0641bb8781307ce2a00a202 SHA-256: 7e6a7f14bf594d4281317c98c1fe0010ca6e9f378cde8dd5fd1c837fcd6b7cd6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with the primary URL pointing to a website that appears to be related to search engine optimization. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://jottigo.ru/wb?keyword=will%20grayson%20will%20grayson%20ending%20summary
    • https://jedijevabepepox.weebly.com/uploads/1/3/0/7/130739982/30f5b9827.pdf
    • https://xobijuveja.weebly.com/uploads/1/3/1/6/131606615/genufe.pdf
    • https://xigeworimejol.weebly.com/uploads/1/3/1/4/131483719/riwenebonibakalo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xapijifas/20050482583.pdf
    • https://s3.amazonaws.com/vuxirefare/73548237289.pdf
    • https://s3.amazonaws.com/feseni/11298830513.pdf
    • https://s3.amazonaws.com/regufojalojaza/nulemejewitiwag.pdf
    • https://s3.amazonaws.com/poguvelefa/84219784993.pdf
    • https://s3.amazonaws.com/gixirojozogufux/fesivow.pdf
    • https://s3.amazonaws.com/nokiva/what_skills_are_needed_to_be_a_network_engineer.pdf
    • https://uploads.strikinglycdn.com/files/5cc478e7-363a-4ab7-bd6e-b38940746342/why_is_my_xfinity_remote_not_changing_channels.pdf
    • https://s3.amazonaws.com/xeropizuwe/tulen.pdf
    • https://s3.amazonaws.com/wetevali/instrumentation_technician_training.pdf
    • https://uploads.strikinglycdn.com/files/0cba298e-9914-406e-b68a-5bd8fb4caa58/is_the_shining_on_netflix_australia.pdf
    • https://s3.amazonaws.com/tuxenipup/wilderness_first_aid_course_colorado.pdf
    • https://s3.amazonaws.com/rabewiruzitewa/xepax.pdf
    • https://s3.amazonaws.com/woberiz/sogefosorukeso.pdf
    • https://s3.amazonaws.com/xewamejixolefaj/somuxada.pdf
    • https://s3.amazonaws.com/tugabijenovili/6673171133.pdf
    • https://s3.amazonaws.com/zetituri/sejidusupanupowil.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_off00010a5b.bin
acf7f26365ec54a49eed3334871939ddb077a5a7d5479142a9fcb2e9cbb93725		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5B 53268 bytes
font_01_sfnt_off0001ab2a.bin
fd0c27e3f185aadc00b9e4fe257b2e2055c2ccb278b30f2d08bcd6ef8848abc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB2A 5352 bytes
font_02_sfnt_off0001bd65.bin
e78912d516ed9dda81d3c3e228fe77854eb7ac85653812b5a0ce55baf2b498e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD65 11092 bytes

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