Malicious PDF — malware analysis report

Static analysis result for SHA-256 54355a3c01336d69…

MALICIOUS

PDF

87.9 KB Created: 2021-03-17 09:00:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 95aa9f80c88e3254bfddb62331283d51 SHA-1: 87f5a69e205a7da3d2767f74f5bfdfb92a817bda SHA-256: 54355a3c01336d69ebfd705ef00386a6c778aed41aad25496a3f97db38f98755
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded document body, though partially corrupted, contains text related to search queries, further supporting the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • 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://golowaki.ru/wix?keyword=dbq+focus+the+scientific+revolution+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376086/normal_604100d63f95f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388271/normal_602e05f962ea4.pdfIn PDF document text
    • https://rimozaruminipa.weebly.com/uploads/1/3/5/3/135391391/e405e2a6004b3eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471995/normal_5ff4a4737347d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483624/normal_5ff55592a303f.pdfIn PDF document text
    • https://cdn.sqhk.co/xitilesuxiw/jLAGido/xakidakubo.pdfIn PDF document text
    • https://mekasirizi.weebly.com/uploads/1/3/5/3/135325166/6063612.pdfIn PDF document text
    • https://cdn.sqhk.co/dobajinorite/c7jfjby/get_contacts_online_cheap.pdfIn PDF document text
    • https://cdn.sqhk.co/netimawifes/gpCqheC/jedonotedubobofejisawuku.pdfIn PDF document text
    • https://cdn.sqhk.co/nefakovuwot/fgfwo3j/17560456992.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_ed8e4f1a59214d92a106e21783b472b8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wezukep/how_to_fix_my_ps4_eject_button.pdfIn PDF document text
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_6df48f0576214c5c96f7abe4413067f2.pdf?index=trueIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_c4bfa413531c4f798e52fbb159236382.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/najubu/we_yevgeny_zamyatin_ending.pdfIn PDF document text
    • http://zepurudevivo.rf.gd/how_to_make_my_sony_blu_ray_player_region_free.pdfIn PDF document text
    • http://laganomezavarof.epizy.com/healthy_diet_for_blood_group_b_positive.pdfIn PDF document text
    • http://debubiduselez.epizy.com/scarlett_2i4_first_gen.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/dipapositavogip.pdfIn PDF document text
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_77b9d34ff5734a3a9c33299f82a5c19c.pdf?index=trueIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_15d187cb14504d13a939a58b101fab07.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/charlie_brown_jr_acustico_mtv_cd.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/59154631287.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11961 5384 bytes
SHA-256: 1e5947b6c6a0b0e2f870d6ebaa9a3f44882df9a645c8a5b2af6b906978c5fe86
font_01_sfnt_off00012bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD4 11368 bytes
SHA-256: 7a35fd133d520eaea70aff8ba1371bc8fec3bd738f59fd9774fda0a01f6572f8