Malicious PDF — malware analysis report

Static analysis result for SHA-256 2141078df7bf63d0…

MALICIOUS

PDF

110.3 KB Created: 2021-02-15 06:08:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 634bd6e701c801f7d306e66f8bf9a46a SHA-1: a54d2bd0c1e3cd86633ee999a25868045def83ac SHA-256: 2141078df7bf63d0a9e4bd1dab0ffe606c4f6ba57a2edb47971bb81bfef89742
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 or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/123?utm_term=beauty+pageant+question+and+answer+about+education+tagalog PDF link annotation
    • https://jewesorovusupim.weebly.com/uploads/1/3/6/0/136092124/7d08606cabb2.pdfIn PDF document text
    • http://merovew.xyz/waste_management_business_plan_in_indiafpzyp.pdfIn PDF document text
    • http://wiregabjuk.fun/free_printable_prayer_journalm8lt5.pdfIn PDF document text
    • https://cdn.sqhk.co/waladoved/qiYicVI/cartoon_craft_hack_apk_download.pdfIn PDF document text
    • https://fadapezak.weebly.com/uploads/1/3/0/7/130775088/fe933dc6d1ce2.pdfIn PDF document text
    • http://guitar.su/231562887376ywbz.pdfIn PDF document text
    • https://rubosesizip.weebly.com/uploads/1/3/4/7/134744628/3228102.pdfIn PDF document text
    • https://tatonipek.weebly.com/uploads/1/3/4/8/134874136/wiboxegiw-lemafete-nakupifodokurid.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/hjjdhc1/my_talking_lady_dog_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zolewiko/jalghhi/digital_voice_recorder_for_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/setawigiz/m5ijig2/marxism_leninism_maoism_basic_course.pdfIn PDF document text
    • http://swast-group.website/38248276724w6n98.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393362/normal_6001819bb1db0.pdfIn PDF document text
    • https://cdn.sqhk.co/wojidumezu/iihjzLL/nitolebososado.pdfIn PDF document text
    • https://cdn.sqhk.co/jegamaxegev/hiegdzj/kavizikofijivodisadumubun.pdfIn PDF document text
    • http://geosen.net/bazeligositosiki3dc48.pdfIn PDF document text
    • http://detonic-italy.website/nenedudakozubirulantubq.pdfIn PDF document text
    • https://cdn.sqhk.co/noviraxat/KidLGqN/bubble_tea_popsicles.pdfIn PDF document text
    • http://copyrightsupport-ig.com/chomsky_normal_form_converter19sxo.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://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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001521e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1521E 4296 bytes
SHA-256: 850d0c7bbd25ed91a16560f0516d4819fef4e2b852a5e76b390e07e027c38e4d
font_01_sfnt_off0001610e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1610E 5632 bytes
SHA-256: 8de2fdb39c15b657f2dbdba18bb5f2d72d6c608eb7aa046fe108075678c93c43
font_02_sfnt_off00017449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17449 12324 bytes
SHA-256: b0afc64d13ced2978e3c29f09d379bec20a3a9cc5c207c17a814ee72d9fe7cbe
font_03_sfnt_off00019cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CB2 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c