Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f1d4eb0f765f06…

MALICIOUS

PDF

91.9 KB Created: 2021-03-27 16:00:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 413abc2095cbc70c53cb7a7be374caf2 SHA-1: d1ea436783b10133e9a1d37bd5a364a2ce6e207a SHA-256: e8f1d4eb0f765f06e6115487044fa6ccb3ece95be144f11bd61798a476243722
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' reveals a large number of external links, suggesting a phishing or scam operation designed to redirect users to malicious content. The presence of embedded URLs further supports this, likely serving as part of the redirection chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://soxebez.ru/wix?keyword=standard+and+scientific+notation+worksheet+mixed+es1
    • https://kojaresojew.weebly.com/uploads/1/3/4/3/134312518/7980484.pdf
    • https://polabobaxadujo.weebly.com/uploads/1/3/4/7/134775235/9006456.pdf
    • https://cdn-cms.f-static.net/uploads/4366646/normal_602b61f284b43.pdf
    • https://static.s123-cdn-static.com/uploads/4375705/normal_5fde490c916f8.pdf
    • https://static.s123-cdn-static.com/uploads/4493200/normal_5feb585c02d9a.pdf
    • https://cdn-cms.f-static.net/uploads/4417537/normal_60191b163299e.pdf
    • https://jixusalozexifan.weebly.com/uploads/1/3/1/4/131407855/xaremizumal_womikur.pdf
    • https://cdn-cms.f-static.net/uploads/4384308/normal_60417360f2197.pdf
    • https://xefikusog.weebly.com/uploads/1/3/5/3/135390274/5848642.pdf
    • https://cdn-cms.f-static.net/uploads/4451045/normal_6018d97190dfb.pdf
    • https://cdn-cms.f-static.net/uploads/4485579/normal_6013dab3bfba4.pdf
    • https://jemijibiwozigep.weebly.com/uploads/1/3/4/8/134855884/lomiwiporaxuv.pdf
    • https://static.s123-cdn-static.com/uploads/4485442/normal_5ff61737042f3.pdf
    • https://static.s123-cdn-static.com/uploads/4380223/normal_6000079449411.pdf
    • https://nipixajivoru.weebly.com/uploads/1/3/1/4/131436983/7621218.pdf
    • https://wazolupagod.weebly.com/uploads/1/3/0/7/130775763/9741392ba96344.pdf
    • https://cdn-cms.f-static.net/uploads/4383797/normal_6034418cae59b.pdf
    • https://tuwunujanopir.weebly.com/uploads/1/3/4/6/134617400/3393307.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1d9f79f3-2a5d-4d79-99c5-d785738f7bbe/who_is_the_best_real_estate_agent_near_me.pdf
    • https://uploads.strikinglycdn.com/files/6c32dbaa-64e7-4736-a29c-7eafcbd9dd4b/tc_electronic_flashback_x4_delay_manual.pdf
    • https://s3.amazonaws.com/lebaxa/azhar_video_song_tinyjuke.pdf
    • https://s3.amazonaws.com/kefodek/73097245639.pdf
    • https://uploads.strikinglycdn.com/files/0daba7ab-41c9-4c2f-926f-0f107af5625a/what_are_the_three_genres_of_oral_literature.pdf
    • https://uploads.strikinglycdn.com/files/7557e906-1292-4432-a32b-64899547a8cf/what_major_events_happened_in_spain.pdf
    • https://s3.amazonaws.com/sojaxub/87918584158.pdf
    • https://uploads.strikinglycdn.com/files/0845ef04-b2bb-4ce2-99b9-dfff5b9609a0/what_makes_a_man_charles_aznavour.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010573.bin
e945a8ec8ef7a1d495d1dc0fafff11f8f3b32816f0663ec68239f256b67f201c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10573 10192 bytes
font_01_sfnt_off000126fd.bin
deb623ac8f87a11e501d52e8d0ce90d38ef2048e37752cc201b778e52e99a22e
pdf-font-stream PDF embedded font (sfnt) at offset 0x126FD 5608 bytes
font_02_sfnt_off00013a04.bin
9ee8eaf3ef94fc80c0b41b1e290ce9530f59860de129cd83bcf9edf22ac7ee92
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A04 11416 bytes