Malicious PDF — malware analysis report

Static analysis result for SHA-256 e496bd23c42b64e9…

MALICIOUS

PDF

73.1 KB Created: 2021-03-05 12:19:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c387793d69f5865e2d9ab5222616407f SHA-1: ddeae6a17a67d7daf4aa648a9fdd31380dc45d11 SHA-256: e496bd23c42b64e96604ec3556c500371eff025304b9ff3517fb906159ce958d
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs and the heuristic findings of a 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' point to a campaign distributing malicious content through a network of SEO-optimized PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/wix?keyword=nyc+public+school+calendar+september+2020 PDF link annotation
    • https://menafove.weebly.com/uploads/1/3/1/4/131438456/055504b.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/tge1Tjg/raxofonugotojafexafa.pdfIn PDF document text
    • https://cdn.sqhk.co/reruzemafow/yS1jez3/vekakupofebutubasuxonowo.pdfIn PDF document text
    • http://konsalting.info/41178565442e7am.pdfIn PDF document text
    • http://lesifipi.22web.org/ets_gre_score_report_request.pdfIn PDF document text
    • http://damvglaz1.xyz/candy_crush_soda_game_uptodown2lud0.pdfIn PDF document text
    • https://gazuxajolitivik.weebly.com/uploads/1/3/4/7/134770387/5548644.pdfIn PDF document text
    • https://tibiwoxot.weebly.com/uploads/1/3/4/8/134881218/sanuzosekep.pdfIn PDF document text
    • https://cdn.sqhk.co/goxufime/cpZicvu/sniper_gun_range_game_download.pdfIn PDF document text
    • http://damodudajipofem.22web.org/audre_lorde_poetry.pdfIn PDF document text
    • https://tivositazevuzin.weebly.com/uploads/1/3/5/3/135349871/6808941.pdfIn PDF document text
    • https://gugukufetufa.weebly.com/uploads/1/3/4/3/134337187/2c77fcd4c6ebb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mubufelijora.epizy.com/berthold_akzidenz_grotesk_bold_condensed.pdfIn PDF document text
    • http://wiwazisumi.rf.gd/banivivivokuzufe.pdfIn PDF document text
    • http://zukivit.epizy.com/7419048287.pdfIn PDF document text
    • http://vivimaga.epizy.com/automobile_engineering_rb_gupta.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_off0000e0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F5 5796 bytes
SHA-256: db423f9611323b9bed87fd67fa7e7f06391fc165d4796233265ce6a56cb56c95
font_01_sfnt_off0000f489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF489 10196 bytes
SHA-256: 4eb0240664dd657044d3ae4d1e9703ffa57d5b279fb7b6c71614d308332a2e1c

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