Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae468e9c21d3945…

MALICIOUS

PDF

82.4 KB Created: 2021-04-13 09:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27ed38314d92903232035b7278d49ae3 SHA-1: 2889fc828eb0a01f1ad09c9d30c080cae92b0288 SHA-256: 8ae468e9c21d39456401d4999a67357cfa26ca3020a1a25667e82919e27d336c
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 of which are embedded within the document body, suggesting a link farm or SEO spam tactic. The primary external URL, 'https://nipisod.ru/strik?utm_term=how+to+tell+if+your+fuel+pump+is+bad', is likely part of this scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, possibly related to phishing or malware distribution.

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://nipisod.ru/strik?utm_term=how+to+tell+if+your+fuel+pump+is+bad
    • https://cdn-cms.f-static.net/uploads/4419192/normal_602410cd4c29e.pdf
    • https://static.s123-cdn-static.com/uploads/4473322/normal_5fedd81d3d73b.pdf
    • https://cdn-cms.f-static.net/uploads/4458125/normal_60274ce2dde8e.pdf
    • http://betabudon.iblogger.org/etica_para_amador_capitulo_2.pdf
    • https://cdn-cms.f-static.net/uploads/4462056/normal_601f879d44c7d.pdf
    • https://cdn-cms.f-static.net/uploads/4444636/normal_602fdd53ea761.pdf
    • https://cdn-cms.f-static.net/uploads/4387241/normal_602f5d90a8aeb.pdf
    • https://cdn-cms.f-static.net/uploads/4391015/normal_6032fe4330dfb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_c347e2cf829d4976be56d33d7aa4363a.pdf?index=true
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_a3e1bf0fb05e4757a47085965b03430f.pdf?index=true
    • https://198d5876-2e36-4a54-a59d-b4c1060b65be.filesusr.com/ugd/4733ca_9b48c68c9de54b7ca947d17e2e5073e3.pdf?index=true
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_7146bd7ace4e456892798c125aece875.pdf?index=true
    • http://bowibimedex.rf.gd/hiatal_hernia_surgery_guidelines.pdf
    • http://luwikomoxure.epizy.com/69276560070.pdf
    • http://wawaxujogoned.rf.gd/dajul.pdf
    • http://mojamolo.rf.gd/93510548616.pdf
    • https://4c982f7a-b72b-446d-8c7a-5e2d6818c0db.filesusr.com/ugd/519a61_d2bac4e053b5461999c7d5ee6199e211.pdf?index=true
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_21b2078a64534d909073ee1e1c467fe2.pdf?index=true
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_31f59c5e7b5744a6bd513bd8c4cccd7d.pdf?index=true
    • http://talifox.rf.gd/graco_glider_lx_gliding_swing_not_swinging.pdf
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_28e0d4aaf0944de6b532f6888f520cc2.pdf?index=true
    • http://tejufujoketaw.epizy.com/the_mushroom_at_the_end_of_the_world_audiobook.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001029d.bin
b8fcbf4fd1691b8bf03bb7a4becd503d3c5307de5f8e0d94e672573c172a52dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1029D 5480 bytes
font_01_sfnt_off00011537.bin
3fc734010c38d47b3fef70bc02cbe6b723424a0f78c1ec54eba38fafd9db9844		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11537 11480 bytes

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