Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa3495bbf283183…

MALICIOUS

PDF

84.6 KB Created: 2021-02-10 03:49:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6612832190523c16b755effb3b102f60 SHA-1: 4808920745d21ed84b693e60f3eca7c6aef99b92 SHA-256: 1fa3495bbf28318362dcff309237bbd90ca753a000c31c7ee02857ba1ec66c8a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a network of malicious links. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings strongly suggest a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=esl+worksheets+classroom+language PDF link annotation
    • http://fresh-ita.fun/ranipakef8lnr0.pdfIn PDF document text
    • http://garantiya62.ru/suwasateluwitiyx4m4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407747/normal_5fd7c1ca45a17.pdfIn PDF document text
    • http://epipog.com/baja_autoestima_situacional71vru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379377/normal_6022c1e731053.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427274/normal_5fed9cb7842e1.pdfIn PDF document text
    • http://logorag.22web.org/bottle_label_template_free.pdfIn PDF document text
    • https://matixibufi.weebly.com/uploads/1/3/0/8/130873880/nivezubivapis.pdfIn PDF document text
    • http://presentinsta.online/diabetes_pregnancy_treatment_guidelinesxz52h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477369/normal_6005fd2214b4f.pdfIn PDF document text
    • https://fenikazegalo.weebly.com/uploads/1/3/1/3/131379965/sisazizulexusun-butorafewezinax-muravekowif-xubeporiwotamaj.pdfIn PDF document text
    • http://bcipreactivaperu.com/58554604488iu4r9.pdfIn PDF document text
    • https://wesotapaxo.weebly.com/uploads/1/3/4/4/134488604/zobowejebudamimij.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://mipatupi.epizy.com/flexera_flexnet_11._16._2.pdfIn PDF document text
    • http://suwugiborewetel.rf.gd/gidedemegipalaxawinuz.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_off00010155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10155 5160 bytes
SHA-256: 3e759cd952dc9e124ed00c25991a906b6f48abd7c0328dec3a0efb051cbe6cc4
font_01_sfnt_off000112d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D3 10588 bytes
SHA-256: 9789f95ab709ea332471099c1feddd7517b7014692188fb8a0dce0bdd91fe1ef
font_02_sfnt_off000136e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E3 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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