Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cae15ef1ac5fffa…

MALICIOUS

PDF

76.2 KB Created: 2021-05-17 03:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3bb48789a679d1149c0dbbed43de75b0 SHA-1: 785c3ca0611f2481dda5442647e179acf14a96ea SHA-256: 0cae15ef1ac5fffaecdfa7bf39f7804e144c0c230630f3ec3a63fffbb1ac6c0c
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, with a critical heuristic identifying it as a link farm. ClamAV detection and ML classification strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm suggest a phishing or SEO poisoning attack vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/strik?utm_term=the+five+dysfunctions+of+a+team+activities
    • https://cdn.sqhk.co/kamozipu/ehfibNE/adidas_face_mask_black_small.pdf
    • https://cdn.sqhk.co/fofodafexadu/4jchhih/kids_kitchen_appliances.pdf
    • https://cdn.sqhk.co/lididiregi/vifrgc0/the_eagles_greatest_hits_full_album_2018.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_b389dac50cc3422dbf0e381d5f536893.pdf?index=true
    • https://s3.amazonaws.com/pibajuwi/edgenuity_answers_english_2_semester_2.pdf
    • https://s3.amazonaws.com/kubafezin/xunenezadegetawosezazabi.pdf
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_da8ecb76150e4930b639722e48fcb655.pdf?index=true
    • https://689a2394-1721-4ce0-b6f7-af9f1dc0d621.filesusr.com/ugd/0f5b72_ffd475d1266a47abb4d3eedb1b307a56.pdf?index=true
    • https://s3.amazonaws.com/wusone/73720848619.pdf
    • https://s3.amazonaws.com/votuweroxigezog/53312151168.pdf
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_9449dcfac54a41e186e84e6200b10ac9.pdf?index=true
    • https://3568ea06-17fa-4787-91ae-86b9aa918cbd.filesusr.com/ugd/8ade13_638299587048422da2ca1d9a08ed025d.pdf?index=true
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_cb2db091a2fc4435bfae61fbccc062e5.pdf?index=true
    • https://591e60e9-54e8-4b06-a9a7-f2e0522969d0.filesusr.com/ugd/1fd4b7_4556b36af4ba42e5817b8958705fcde8.pdf?index=true
    • https://s3.amazonaws.com/naxozelozude/introduction_to_computer_systems_and_assembly_programming.pdf
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_e1cd977ff2b94aa0b6308565042b89fa.pdf?index=true
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_0545ff2d20574fefa77bcc2bc0d3a3b7.pdf?index=true
    • https://s3.amazonaws.com/risalenefazozo/is_a_hypothesis_and_theory_the_same_thing.pdf
    • https://s3.amazonaws.com/gofilafixu/how_to_fix_cabrio_washer_lid_lock.pdf
    • https://s3.amazonaws.com/xulepiwa/genetics_exam_questions.pdf
    • https://s3.amazonaws.com/fadupazageraf/xinudavo.pdf
    • https://2f8a6ab9-e864-4757-b083-6627a13f4c48.filesusr.com/ugd/405339_df49d53904d94b37a8dc9fd2bb2cfd4c.pdf?index=true
    • https://s3.amazonaws.com/figidireki/lovarosoguxir.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_off0000ec85.bin
163a65246a942fb76f760d98c5fea37cd4df9e1cd6577d8e6f37b0927dd996bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC85 5244 bytes
font_01_sfnt_off0000fe4b.bin
e6f927b920040016cfd0c12021cdcc09eb73e375c249331e00536d8bec058104		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4B 10864 bytes

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