Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2d2f8faf958c6f5…

MALICIOUS

PDF

84.4 KB Created: 2021-04-20 13:41:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6bbdc0a4d7ba18e251c29943a40192ec SHA-1: 50da98b94d36bee7d3cf84307e1895f2a1f41a71 SHA-256: f2d2f8faf958c6f519d0f7b4582a883d9d63f6c878d03eea0d82e6b8dc211bc6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a common phishing or malware distribution technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://jacksth.ru/strik?utm_term=fallout+4+automatron+dlc+level+requirement PDF link annotation
    • http://aicberg.net/gefelepipemupfes8q.pdfIn PDF document text
    • http://lovumodezubudem.iblogger.org/chori_chori_movie_video_song.pdfIn PDF document text
    • http://remont-pc.website/mepegavajiqhs3g.pdfIn PDF document text
    • http://pitushok.fun/holt_mcdougal_algebra_1_answers4cnjw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409827/normal_600ce0c7dc9d1.pdfIn PDF document text
    • http://azorocheat5.xyz/30-day_indian_keto_recipesfj1zq.pdfIn PDF document text
    • http://beremoter.online/slither_io_hacks_mobilezz2qy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456372/normal_605d46e9273f2.pdfIn PDF document text
    • http://erogancolumbia.site/6984204325muz7g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402707/normal_6057b2021ba41.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xigokabuwawi.epizy.com/kepujutizavutediwimiv.pdfIn PDF document text
    • http://ruzukelifibu.epizy.com/icelandic_to_english_dictionary.pdfIn PDF document text
    • http://lususexore.epizy.com/kofibedavit.pdfIn PDF document text
    • http://bopenakonaj.rf.gd/the_economist_24_november_2020.pdfIn PDF document text
    • https://57ead060-d7b3-4f59-a803-6c9b47c0028a.filesusr.com/ugd/f30481_582c1483ab954ef2b429c5d55cce3a7b.pdf?index=trueIn PDF document text
    • http://romezegipoxo.epizy.com/28869207105.pdfIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_a2aae087068e44bf96876802ae19437d.pdf?index=trueIn PDF document text
    • https://74df6fe0-557b-4e47-8461-f2df536053d0.filesusr.com/ugd/4dcf4e_c2d6db74f6f34ecf8b4cbda91502db9f.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB5 5136 bytes
SHA-256: f33e90cdf96590221fb4df716fe127e4ba3d62910d108c408399b2f3ae1cf93d
font_01_sfnt_off00011c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C27 12920 bytes
SHA-256: d90cbcfc4cc3da5f2bb7b94dfedf2fcfe31a40af140b342867d063c70f2bfd96

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