Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be7813be14d29bd…

MALICIOUS

PDF

72.9 KB Created: 2021-03-12 08:34:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ac90863649a26f0ad314a573eb8242c6 SHA-1: ba95c1ed8ab9a15c5c79c47caf49eae201c183c5 SHA-256: 1be7813be14d29bde5406db2c0c9dc7f416c26b958685580eb15a9abf3c14f62
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 pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pelibifir.ru/123?utm_term=chasing+cars+snow+patrol+piano+sheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477615/normal_6026e19a20c43.pdfIn PDF document text
    • https://sakavafufegig.weebly.com/uploads/1/3/5/3/135323197/zafanubokofotozu.pdfIn PDF document text
    • https://babivefe.weebly.com/uploads/1/3/5/3/135312435/aeaa7643f7fb.pdfIn PDF document text
    • https://metatigizedi.weebly.com/uploads/1/3/1/3/131398099/welimibabo.pdfIn PDF document text
    • http://sawotawigusewon.22web.org/risiselapuvagonigikug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385421/normal_601996fb390a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405903/normal_5fe673849ed99.pdfIn PDF document text
    • https://fafafavavilaba.weebly.com/uploads/1/3/4/8/134893162/2073630.pdfIn PDF document text
    • https://mokogexikimowo.weebly.com/uploads/1/3/4/3/134321985/maxot.pdfIn PDF document text
    • https://siminanora.weebly.com/uploads/1/3/4/6/134611077/6694e.pdfIn PDF document text
    • https://gebifulud.weebly.com/uploads/1/3/0/7/130775692/6391985.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387427/normal_5fdae3d9a8e03.pdfIn PDF document text
    • https://saxarewuvopa.weebly.com/uploads/1/3/4/8/134855039/zasinodelur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417426/normal_600ae2a6787f2.pdfIn PDF document text
    • https://wapavamo.weebly.com/uploads/1/3/1/6/131637186/raregom.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/xufoxorog/certificate_of_participation_template_word_free.pdfIn PDF document text
    • http://lafafodewasu.rf.gd/actuarial_science_definition.pdfIn PDF document text
    • https://058da8ce-bb30-4b8c-81eb-8903018cac65.filesusr.com/ugd/ab745b_8b4b25cb723a444cb833625dec1e26a5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/dipoledezavi.pdfIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_b9594b1912f3403ba3a50c81c62fa05a.pdf?index=trueIn PDF document text
    • http://desibevazivoxan.rf.gd/96670134591.pdfIn PDF document text
    • http://wokasob.rf.gd/rolimesuxovujixedumotuz.pdfIn PDF document text
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_6261b92fb8534606885270a62795ef98.pdf?index=trueIn PDF document text
    • http://raraviwikemuliz.epizy.com/toefl_ibt_word_power_vocabulary_course_free_download.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_off0000da1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1A 5192 bytes
SHA-256: d177662291e0360dc2920e826ea87f81c9fb48b28a166c286ea1040fc62c2d8a
font_01_sfnt_off0000ebd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD3 12040 bytes
SHA-256: 0ec8b11c01633680fd2379f3a47c76499e668ebf6d59c2376b140e0f87d82dfd