Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef91e9795cb1b6e…

MALICIOUS

PDF

79.5 KB Created: 2021-03-04 10:47:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b1d235de0a68bf84f53ee8e64ff9b07b SHA-1: 28ac7fcc2902ce0f00c7117f4977481df037535e SHA-256: 4ef91e9795cb1b6efaaaa3f7e69a15280b4b76d464391d8493d2e1107039c7d8
186 Risk Score

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 hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains a keyword related to a common search query, likely intended to trick users into clicking the malicious links. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/award?keyword=how+to+answer+a+call+on+plantronics+headset PDF link annotation
    • https://sifudalumavobu.weebly.com/uploads/1/3/2/3/132302711/2266845.pdfIn PDF document text
    • http://cyberghost.store/dagosuzo6iy7i.pdfIn PDF document text
    • https://cdn.sqhk.co/tenalewi/jfjcgjm/zafuboferelojuxunedoz.pdfIn PDF document text
    • https://ledajesaler.weebly.com/uploads/1/3/4/0/134041179/6b5c9f6d203f91.pdfIn PDF document text
    • https://bazofaxeretaw.weebly.com/uploads/1/3/4/8/134868688/nalume.pdfIn PDF document text
    • http://storezone.info/puwijuvizolavok5k4s.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefima/gfgAidQ/pilixagiru.pdfIn PDF document text
    • https://zegazofegu.weebly.com/uploads/1/3/5/2/135296009/pekivebirokex.pdfIn PDF document text
    • http://xizunamorazoved.iblogger.org/39814217750.pdfIn PDF document text
    • https://selewoxad.weebly.com/uploads/1/3/4/5/134523288/dupaget-daxelefetogoj-gemunesorud.pdfIn PDF document text
    • http://afracheat2.xyz/relationship_questions_and_answercf6wd.pdfIn PDF document text
    • http://canonsburglake.com/what_to_do_after_a_public_relations_degreeq8m70.pdfIn PDF document text
    • https://jojusilinu.weebly.com/uploads/1/3/4/3/134343509/3dcb7ff7.pdfIn PDF document text
    • https://cdn.sqhk.co/tabuguran/jhchbja/26635011742.pdfIn PDF document text
    • https://tutuludoj.weebly.com/uploads/1/3/0/8/130874598/fotojejomobopuj.pdfIn PDF document text
    • https://lifalaril.weebly.com/uploads/1/3/4/8/134883644/3746640.pdfIn PDF document text
    • https://cdn.sqhk.co/reparepoki/ifMhdkr/27306751391.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lugimes.epizy.com/durango_wildlands_beginners_guide.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_off0000fbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAB 5212 bytes
SHA-256: 87d440d2ebb92f5d6610dad18010bba4294564aaa29632cc271a5587732d81a4
font_01_sfnt_off00010d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D68 10144 bytes
SHA-256: 635b65171350771e07525c506e04263c0b165fafef77244c39bf2677ef5ea56c

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