Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc377322c1a4ae01…

MALICIOUS

PDF

94.7 KB Created: 2021-03-01 11:01:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 2e674a26d44cbf48d1cd2c698014bc02 SHA-1: afb2a206480d79369f10949f3c799df3f4964d17 SHA-256: bc377322c1a4ae01f03ba3d5731db87e25fd54db66693aa5b649bd54f6d4245b
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating it likely serves as a phishing or spam lure. The document contains a large number of embedded URLs, many of which point to disposable hosting or known redirectors, suggesting a link farm designed to drive traffic to potentially malicious content. The presence of a URL related to 'pubg mobile mod apk unlimited uc' further supports a phishing or scamming intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/wix?keyword=pubg+mobile+mod+apk+unlimited+uc In PDF document text
    • https://cdn-cms.f-static.net/uploads/4414341/normal_60147756ce7ef.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/how_to_write_a_reading_reaction_paper.pdfIn PDF document text
    • http://clyb-wylcan3.space/mitologia_griega_y_sus_principales_diosesbhlk5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452862/normal_5fcbd073a822d.pdfIn PDF document text
    • http://suvuxivenorum.mypressonline.com/bluebook_citation_generator_cases.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489740/normal_5fdc4a08617db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368964/normal_5fd10e1cea08e.pdfIn PDF document text
    • https://giwitororozesal.weebly.com/uploads/1/3/4/6/134652081/jebodu_xiboma.pdfIn PDF document text
    • https://kikitepolo.weebly.com/uploads/1/3/4/5/134514310/nugigopogapozofex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504839/normal_601e2c9d2a9d5.pdfIn PDF document text
    • https://depasosuva.weebly.com/uploads/1/3/4/4/134483816/7a977865c88.pdfIn PDF document text
    • http://requiredjokblog.com/6513452247211ka8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403681/normal_600ee951ea75b.pdfIn PDF document text
    • http://funomixukipiv.iblogger.org/laboratory_design_guidelines.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369916/normal_603b79cc3dead.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rolodumom.epizy.com/breakthrough_2019_soundtrack.pdfIn PDF document text
    • http://wutejaxevewef.myartsonline.com/55348576904.pdfIn PDF document text
    • http://kixixiwibatogit.epizy.com/34356701693.pdfIn PDF document text
    • http://zitulogakapede.myartsonline.com/kometemip.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000121b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B3 5324 bytes
SHA-256: b007500e7d936dcb5aa18096d1a4afbfe14bad54d9663a2a4baba8be93d0ccf9
font_01_sfnt_off000133bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133BF 10604 bytes
SHA-256: d1ad0fd9a14d08f5aafb1b98bb7a07118a4f0f1a1f1f12c829dde1521490d412
font_02_sfnt_off000157f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157F1 16136 bytes
SHA-256: 3f401360053e1b4d29c24019386b3079856d27c1a6fb1731fc2abffa1f8e552c