Malicious PDF — malware analysis report

Static analysis result for SHA-256 832587bbb9e12b6a…

MALICIOUS

PDF

84.0 KB Created: 2021-01-24 08:07:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d34ebf9c7138eb256486e0d3f908ad14 SHA-1: 70ef63123f3cfe163ce254c0c4ca0b302410589e SHA-256: 832587bbb9e12b6aeae2ea6a0b822f5061f7263eb90aa61d9f2f3a18a8ea0b6b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/123?utm_term=breadth+first+search+java+binary+tree PDF link annotation
    • https://cdn.sqhk.co/jawuraxexije/uUhiUes/cops_n_robbers_videos.pdfIn PDF document text
    • https://butopejejix.weebly.com/uploads/1/3/2/8/132814220/sejefagutemute_bidevob_raxeg.pdfIn PDF document text
    • https://cdn.sqhk.co/bawijodol/pyxibbj/86486926546.pdfIn PDF document text
    • http://tevuvisena.iblogger.org/offline_android_games_mod_apk.pdfIn PDF document text
    • https://tufojeju.weebly.com/uploads/1/3/0/7/130740258/3363864.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408336/normal_5fe6931f9bd2f.pdfIn PDF document text
    • https://cdn.sqhk.co/vomuvojovi/djegexW/baxof.pdfIn PDF document text
    • https://cdn.sqhk.co/zijikunu/hgeItgc/zivigubaxejorog.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/OEhhIjf/stickman_street_fighting_city_blocky_gangsters.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/gibbEVO/whispering_angel_wine_price_uk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463812/normal_5fff440d2c821.pdfIn PDF document text
    • http://paxawujaxoda.22web.org/susezijuletitivixoxar.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/jgZjdgd/exponential_idle_torus_puzzle.pdfIn PDF document text
    • https://julamukipupa.weebly.com/uploads/1/3/0/7/130739907/2393053.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://jigabez.epizy.com/clash_royale_hacked_version_for_android.pdfIn PDF document text
    • http://xeravujowa.epizy.com/27947863878.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/81186096265.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_off0000f075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF075 5184 bytes
SHA-256: 7553e1f175e3faa7aa345bcdbcc8e889bfd163dc708540268a777e8ac86f18c2
font_01_sfnt_off0001021a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021A 16000 bytes
SHA-256: ba9be6213b2344c04eb3a22071b2cab18e156609498268a3e43502db8305110a
font_02_sfnt_off0001347e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347E 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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