Malicious PDF — malware analysis report

Static analysis result for SHA-256 feb6cb5e0e3f99cc…

MALICIOUS

PDF

85.1 KB Created: 2021-02-23 09:30:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 51c98822fb17cb82c2f5032593b336a3 SHA-1: 1d65a56d96c8f9ff8dcbf06062c15264f25dee65 SHA-256: feb6cb5e0e3f99cc0f5562fac3fb184ef4669c68f7fcda22d447194e36682ea5
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this file as malicious, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, suggests a lure related to 'Sherlock Holmes books', likely to entice clicks on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=correct+order+to+read+sherlock+holmes+books In PDF document text
    • http://wordsideget.top/9637420593xyvps.pdfIn PDF document text
    • https://bisojobiregabo.weebly.com/uploads/1/3/4/5/134509607/4380858.pdfIn PDF document text
    • http://alifan.store/341610969682tsx1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472763/normal_5fe253f7cc3c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494669/normal_5fe0e12a5fa2f.pdfIn PDF document text
    • http://idealicaitalia.website/pibafakaniworojufepiqkq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485702/normal_60344cf4a0305.pdfIn PDF document text
    • https://batusapetedovug.weebly.com/uploads/1/3/0/8/130873971/rofijewurevafu-tenekazigake-xesaga-besop.pdfIn PDF document text
    • https://cdn.sqhk.co/rivitovolu/7ja5OGp/wunanezadapijoxakudujir.pdfIn PDF document text
    • https://repugonajipivup.weebly.com/uploads/1/3/0/8/130814926/bugatojutukijev-zugusoput.pdfIn PDF document text
    • https://cdn.sqhk.co/xonepogafix/jjjbI0w/wegad.pdfIn PDF document text
    • http://world-wild-shop.com/78277199136g3w09.pdfIn PDF document text
    • http://copyrightsupport-ig.com/avaya_9508_quick_reference_guideimx5q.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/hgicSjc/kimidiwegeforakojaxibowaf.pdfIn PDF document text
    • http://malespw.xyz/pokemon_insurgence_friend_safari706hf.pdfIn PDF document text
    • http://trychambre.xyz/54575158099az0l5.pdfIn PDF document text
    • https://xovokemopozok.weebly.com/uploads/1/3/4/5/134579322/daburosib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/73579972724.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/negulobakabugisexudugowo.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/yakuza_kiwami_1_rina_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_off00010ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECD 5288 bytes
SHA-256: be708c14ee87af4f6448691bf3a35fb8d7d00d171c24157f4114c0842fa8c71d
font_01_sfnt_off00012095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12095 11244 bytes
SHA-256: 835ec8e10f27e952045296c29fa1bb351b731ba3f946fee21fad76d38a3584ce

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