Malicious PDF — malware analysis report

Static analysis result for SHA-256 34ab55582b04c115…

MALICIOUS

PDF

83.2 KB Created: 2021-02-08 17:52:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 93f61794d71ff5e307d083af9c03709f SHA-1: 1c6f5d8160efe8d62b496f7966026074b59e8ab2 SHA-256: 34ab55582b04c11546e4fbff9126435fab51d5cec20b30e3f6ca15581dacec25
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The embedded URLs, such as 'https://crophysi.ru/aws?utm_term=bus+driving+3d+game++apkpure', suggest a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains strings related to applications and dates, indicating it's likely a lure document. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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/aws?utm_term=bus+driving+3d+game++apkpure In PDF document text
    • http://kengoru.space/strategic_procurement_and_supply_chain_managementnlo9b.pdfIn PDF document text
    • http://gorerusuwoto.iblogger.org/notezumugomi.pdfIn PDF document text
    • http://fastdonwload.space/2101171918kaog4.pdfIn PDF document text
    • https://dunomomavelow.weebly.com/uploads/1/3/1/4/131407267/8c59241.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503214/normal_5fc6b92d09d0e.pdfIn PDF document text
    • http://healthit.space/134179222847dh0a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366359/normal_5ff378f1e0bbf.pdfIn PDF document text
    • http://cashbackmoney.info/33550599983o8bn0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480423/normal_5fc9e420d0c2b.pdfIn PDF document text
    • https://cdn.sqhk.co/kataduzoni/jd5B6he/tazakunax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://rebukupomapet.rf.gd/carrier_infinity_system_control_manual_systxccitc01-_b.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/vcds_lite_loader_exe.pdfIn PDF document text
    • http://dupofax.rf.gd/60892430402.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/halloween_sheet_cake_decorating_ideas.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/bimobepolexikeditamilopu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADC 5276 bytes
SHA-256: 3e43d1039c4aa9be902cc5fedd3223bb56df1849135556205d06a24519046901
font_01_sfnt_off00010cae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAE 10864 bytes
SHA-256: d9687ed6d09116e2529b9a1df426777f621eeb78f38aec8f40659ec7d541e4c4
font_02_sfnt_off000131a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A5 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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