Malicious PDF — malware analysis report

Static analysis result for SHA-256 9efe7df0924b96f0…

MALICIOUS

PDF

78.8 KB Created: 2021-03-27 19:42:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21462c4140c8f8702950badcbabfc59e SHA-1: 1eb4a8b8fc691e18254be44a5f7cf458d81248af SHA-256: 9efe7df0924b96f04401b07d8289bf56f4748648af7b7683604045cd17e69b5e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to benign files, but also includes a suspicious URL that appears to be part of a link farm or SEO spam operation. ClamAV and ML classifiers indicate maliciousness, likely due to the deceptive content and the presence of potentially harmful external links. No scripts were extracted, but the PDF structure itself is indicative of malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=toro+power+max+hd+826+oxe+reviews
    • http://idealica-italy.site/60349888127pku5t.pdf
    • http://nipobudagese.mypressonline.com/equivalent_algebraic_expressions.pdf
    • https://cdn.sqhk.co/vuwibagula/QjiXYOp/xibobujalifofa.pdf
    • http://puduvab.sportsontheweb.net/ielts_listening_band_scores.pdf
    • https://cdn.sqhk.co/wemorapi/eLojhbQ/dixedilorusam.pdf
    • https://cdn.sqhk.co/ruvonusebex/aQqghgi/8567573477.pdf
    • https://cdn.sqhk.co/sogefuluf/nSKkiem/42839487636.pdf
    • https://cdn.sqhk.co/duxadikoti/aGWdbif/jeninusuwovetusujexax.pdf
    • https://cdn.sqhk.co/vofepubot/bialshj/brainstem_cavernous_malformation.pdf
    • http://djami.ru/sony_dsc-f717_memory_stick_compatibilityvbfbw.pdf
    • https://cdn.sqhk.co/pabefidinaz/jjgggje/survival_volcano_island_3d_apk.pdf
    • https://cdn.sqhk.co/merivexasug/hBeEjeW/86319365412.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_c9cbc156e6594843a9ed33e6e0f477ab.pdf?index=true
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_fb73f26ba3c848a3928807314d57f062.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d13cdf11-6a5e-4930-9119-a9713047bc2a/crosman_1077_silencer_package.pdf
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_e8fed9d1001e42d1b2a86310225a0969.pdf?index=true
    • http://bajupigirosinaf.atwebpages.com/list_of_basic_words_in_english.pdf
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_901872c1ab744fb6bb5babd041956f31.pdf?index=true
    • https://uploads.strikinglycdn.com/files/14f6da09-f82b-4216-a073-2286c8740db6/burger_king_2_for_6_mix_or_match_commercial.pdf
    • https://uploads.strikinglycdn.com/files/381978e6-cbfc-4fd8-99a0-d67802fef797/74717983175.pdf
    • https://uploads.strikinglycdn.com/files/df5b658b-16d1-4253-9dd5-66e28f156a80/when_you_love_someone_so_bad_it_hurts.pdf
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_10957b4a64d54e85a9c32399d4264775.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1d6.bin
da6af10c68b81d9142f0a72984176fa3e8e4a826199a6a2d47f7faaebc2d6b8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D6 5816 bytes
font_01_sfnt_off00010591.bin
b1c42b43037caaed913b1b4dcec1c734b41fa485c3624432e0a3b581e7550d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10591 11120 bytes

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