Malicious PDF — malware analysis report

Static analysis result for SHA-256 1012af4cf504d3d0…

MALICIOUS

PDF

121.0 KB Created: 2021-03-18 17:13:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a0645aab57466ccbed259e984997f931 SHA-1: 0a5f39e6e471f634f38510e4c5518338acfb96af SHA-256: 1012af4cf504d3d07c664c676f336b02c4de5758c215ab798b051c75e8523bb8
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to external PDF files, many of which are hosted on disposable domains, indicating a link farm for distributing malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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/award?keyword=the+duchess+of+malfi+summary+pdf+download PDF link annotation
    • https://tazusarativiwu.weebly.com/uploads/1/3/4/5/134510609/618272f60b5c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474176/normal_6033f149e300b.pdfIn PDF document text
    • http://todayit.pro/south_pole_adventurer_ielts_reading_answersmz22t.pdfIn PDF document text
    • https://cdn.sqhk.co/kuniremolu/cHgfKgc/joturezufadekonumugufela.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475582/normal_604871eb26120.pdfIn PDF document text
    • https://jerewerek.weebly.com/uploads/1/3/5/3/135349205/f9f0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449410/normal_6007ec687139a.pdfIn PDF document text
    • https://tezijetukiresu.weebly.com/uploads/1/3/5/3/135394197/dufof_tajutosezeludud_jiveda_tefubov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413226/normal_602c95ded2f06.pdfIn PDF document text
    • https://cdn.sqhk.co/kepilujofeje/pghgdjj/blackpink_call_fake_video_calls_pranks.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483070/normal_5fe2b1ee3f594.pdfIn PDF document text
    • http://trydouche.xyz/stephen_quiller_color_wheelfm561.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414696/normal_60054aad258ac.pdfIn PDF document text
    • http://giocodigital.fun/gexakagumadesipanojakz6ga.pdfIn PDF document text
    • http://idealicaitalia-official.site/xotavoturojartwwl.pdfIn PDF document text
    • http://tuduvodakep.mypressonline.com/bupajodekurimoxetirowuf.pdfIn PDF document text
    • https://cdn.sqhk.co/jekurona/fJgijju/22056930721.pdfIn PDF document text
    • https://mutolumikiwow.weebly.com/uploads/1/3/1/8/131872082/41cf7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420224/normal_601baba46e9ab.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://zesafemumibow.myartsonline.com/harry_potter_and_the_philosophers_stone_netflix_australia.pdfIn PDF document text
    • http://xolavozezimodan.onlinewebshop.net/65755061384.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_off00018dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DFD 5340 bytes
SHA-256: c06fe40109977e858a8966c517dc1566dfb617615e87274ee1fa7a8a0f963781
font_01_sfnt_off0001a009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A009 11872 bytes
SHA-256: 62869de4bca5fc225aa4aa928eff1de4a8e4145846ac321dd5c1f618ddbcfebb
font_02_sfnt_off0001c7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C7C2 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f