Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b1522e1f3dbea2…

MALICIOUS

PDF

76.1 KB Created: 2021-03-08 19:56:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 81384ba1605dc0ba4d5fea445dd712eb SHA-1: 7335d390189ec4e69799ad63697503a0d51a34f0 SHA-256: 55b1522e1f3dbea2e7b4bc4e909d408772a901789d2cdc370873dc9e7cd78c59
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this behavior. While no scripts were directly extracted, the ML classifier and ClamAV detection point to malicious intent, likely related to phishing or malware delivery via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/123?utm_term=escape+alcatraz+game+guide PDF link annotation
    • https://cdn.sqhk.co/gidenateg/aijegfG/22219800365.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393036/normal_60129195dfc87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447278/normal_601e8f0ebb0db.pdfIn PDF document text
    • https://ramilelajebow.weebly.com/uploads/1/3/4/6/134647205/wezonizevi-kagibituvoxap-sijigefeboguli-nosobomo.pdfIn PDF document text
    • https://cdn.sqhk.co/fogibadeku/bjbigtC/20717384782.pdfIn PDF document text
    • https://sovuzozasofebod.weebly.com/uploads/1/3/4/3/134343281/4376526.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/jjhiijp/nolok.pdfIn PDF document text
    • https://wumefabifu.weebly.com/uploads/1/3/4/8/134888429/7408867.pdfIn PDF document text
    • https://gakosokilexavum.weebly.com/uploads/1/3/2/6/132695298/00ae3fccc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464078/normal_60170b8e6fb9f.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/GXAhdhc/grumpy_cat_memes_wednesday.pdfIn PDF document text
    • https://kikuwigew.weebly.com/uploads/1/3/1/4/131407235/dd81b.pdfIn PDF document text
    • https://butitonivo.weebly.com/uploads/1/3/4/3/134314214/fogafaxat-datur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485702/normal_5fcd08a36944b.pdfIn PDF document text
    • https://zonujonuwug.weebly.com/uploads/1/3/4/3/134309714/5063775.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/megulu/galactic_garbage_station.pdfIn PDF document text
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_1cb0bf1ace754b869e1c106c596f0749.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fofeguj/2014_jeep_grand_cherokee_oil_change_required_reset.pdfIn PDF document text
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_6d6d40d869074d27a11b08aac2ee73c1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/watajive/right_and_left_rudolph_game_printable_free.pdfIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_db474362d0904fec982529c006396c0e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/batiku/zutivemufa.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_off0000eef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF7 5400 bytes
SHA-256: 77f0759e61ef85b2dcfc5e3ba27bdf3a9ef520d1396c6eca9cd940cc2225f5f7
font_01_sfnt_off00010148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10148 9972 bytes
SHA-256: 9e6d8b0901e1d8e35b351f4668390112bee4dd4450d99a0d45022cd2f3925355