Malicious PDF — malware analysis report

Static analysis result for SHA-256 a11dbe20c9f63928…

MALICIOUS

PDF

71.2 KB Created: 2021-02-27 03:08:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b949cef8e157014761087799b1dfa99b SHA-1: 9e4da3f0aa79afee48367f42b8d0323241ea0ee9 SHA-256: a11dbe20c9f63928c1037b3638a7856b852c26c023b038337d62c05490bf2292
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable domains and Weebly hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the heuristic firings for PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM support the conclusion that this document is part of a campaign to manipulate search results or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=alfred%2527s+essentials+of+music+theory+book+1+answers+pdf PDF link annotation
    • https://tugixafebav.weebly.com/uploads/1/3/2/6/132681891/053326bbd0c.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/Jhd76jb/wusamagom.pdfIn PDF document text
    • https://funopazotasar.weebly.com/uploads/1/3/1/0/131070342/movuj_wawimilo_waduvetukiti_resugaxexi.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzetuzame/hggjigc/42432479086.pdfIn PDF document text
    • https://cdn.sqhk.co/bijozugetav/hhcISge/fast_followers_and_likes_mod_apk_unlimited_coins.pdfIn PDF document text
    • https://finijigif.weebly.com/uploads/1/3/2/6/132681422/bonorib_bepivumanixosug_roxiwipo_rosewa.pdfIn PDF document text
    • http://energytik.net/bujajonakfabwf.pdfIn PDF document text
    • http://steh-sistem.ru/sibisenokoxirifevotikotaseii8m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368976/normal_60346df4db50c.pdfIn PDF document text
    • http://thiswaytovogue.com/jesenaziwafab0hq7h.pdfIn PDF document text
    • https://ponegibafuzixi.weebly.com/uploads/1/3/1/4/131406662/df6a5.pdfIn PDF document text
    • https://buzixigadojaw.weebly.com/uploads/1/3/5/3/135316262/5656134.pdfIn PDF document text
    • https://cdn.sqhk.co/detatakev/NhhiaF3/kasekal.pdfIn PDF document text
    • http://vengriya.space/beats_solo_1_wired_ear_padsza6qi.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/8Ahcmjf/download_mega_ramps_ultimate_races.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/zesotat/mobile_antivirus_free_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/rironikom.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/zaxegedoguzozomawus.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_off0000d7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A9 5868 bytes
SHA-256: c5ee928d49993a1740f83f0d648d8256190cd9d4bb0aad4bc86e3f653576bb98
font_01_sfnt_off0000eb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9E 10384 bytes
SHA-256: 27352d88b4e28c3802066148fbe74827960ff036b6829804318a623fcf8c1cff

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