Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c8f44dd1dc1bac7…

MALICIOUS

PDF

71.8 KB Created: 2021-03-24 01:13:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07f5f4c22b4d6c67bb6a46292f159843 SHA-1: e986de138c223b2a86df4997703c6f61b534933f SHA-256: 8c8f44dd1dc1bac7cdfd196210175cc2bec915f6e7df196646f780189491c89a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on dynamic DNS services and appear to be part of a link farm designed to manipulate search engine results. The primary URL suggests a lure related to Android FRP bypass tools, a common theme in phishing and malware distribution. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or trojan payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bologen.ru/wix?keyword=easy+frp+bypass+apk+6.0.1
    • https://vafunaparixidi.weebly.com/uploads/1/3/4/6/134627598/4dc418f8343458.pdf
    • https://sajamokof.weebly.com/uploads/1/3/4/5/134599006/zodani_nenubirilukivum.pdf
    • https://kutumamam.weebly.com/uploads/1/3/4/8/134893394/f785535303dfa.pdf
    • http://tozofuji.scienceontheweb.net/c_programming_language_in_hindi_download.pdf
    • http://farozemirig.scienceontheweb.net/grade_9_applied_science_textbook.pdf
    • http://pobunav.sportsontheweb.net/99438693420.pdf
    • http://zakomuxoza.getenjoyment.net/94230789218.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5f6c2085-2dda-434c-b033-002d9f23883a/58316193358.pdf
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_e184436b952d4c4586dc5e17a3bb3330.pdf?index=true
    • http://giworutiw.myartsonline.com/somewhere_over_the_rainbow_chords_in_c_major.pdf
    • https://uploads.strikinglycdn.com/files/cab5b51e-440b-4dc7-9f82-9506e29962f6/what_are_the_6_tools_of_foreign_policy.pdf
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_19da0dcf136247abb737e466b36ccf5f.pdf?index=true
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_03c2d9ced4be45e7abde0fca8df0cbca.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b3fc8f2b-f0b0-4aa5-8028-920a3d0c300f/xabexivatusegox.pdf
    • https://f9cb7010-568c-45d0-b0a5-7bd630b60272.filesusr.com/ugd/b10ea2_d4d1664d6335479dbebb639e2c2d0183.pdf?index=true
    • https://uploads.strikinglycdn.com/files/940e952c-3555-440e-9e7d-f5c1fee727f9/53298625987.pdf
    • https://3682d434-6e27-4ac8-9ac2-d3ec24fa429c.filesusr.com/ugd/9b5f63_9fce2ac49a2345bea6418ecfae2350c8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f0d08396-5c78-434c-bf31-3e057b681ea4/todap.pdf
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_ea0e3f1b7eb54eeeacbd2b4d2e1dcd6e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c818fdcd-199e-4c29-bb83-6c9dc7492bf1/the_maze_runner_3_full_movie_free.pdf
    • https://uploads.strikinglycdn.com/files/fc3fb15d-e4f5-4c2a-aff2-c9b2598f0bf2/what_airlines_dont_charge_cancellation_fees.pdf
    • https://62bfe9e3-d01a-456c-9d14-3ac71290fd99.filesusr.com/ugd/cfe640_8d942cde8d3a4f928746fbcdf7e592ce.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c54257a3-fef9-4e20-9b03-b4a49e52a989/let_the_right_one_in_book_eli_castration.pdf
    • https://uploads.strikinglycdn.com/files/b2f37f04-9779-4537-969c-b3e7c60d502c/is_omega_three_good_for_weight_loss.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_off0000d7ea.bin
26144c8ed06f0556a2761a13bec4d57fcb56a747ac78fb65be1400a6f5af67fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EA 5508 bytes
font_01_sfnt_off0000ead1.bin
5f477c49ac0d209d40eac31710db88ae134fc04b2aea4970e4324e8d94b43798		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD1 10936 bytes

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