Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3b2cd1bc34b24a0…

MALICIOUS

PDF

84.9 KB Created: 2021-02-19 08:55:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 3cace7cdcf2cbe77b271ebaa7b13c939 SHA-1: c379f6dfea6f1f74c86615266e80a1a572b9d763 SHA-256: e3b2cd1bc34b24a0035632cb2b5e69335c19bb50091e4c6f01dc8008347a44b1
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous URLs suggest a phishing or spamming operation. The document body, though heavily obfuscated, contains text related to 'pre employment screening policy template', reinforcing the phishing lure. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://leonvi.ru/strik?utm_term=pre+employment+screening+policy+template PDF link annotation
    • http://alternativeinfluencenetwork.net/95401843014x2ftz.pdfIn PDF document text
    • https://sokowerifali.weebly.com/uploads/1/3/6/0/136053586/8212101.pdfIn PDF document text
    • https://vukuzimina.weebly.com/uploads/1/3/4/1/134109202/lewamenis.pdfIn PDF document text
    • https://rerutafedebe.weebly.com/uploads/1/3/2/8/132815298/7641054.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408464/normal_5fc860811986c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381964/normal_5fe1b20e2404d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390057/normal_6008b0245543b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460682/normal_6022f725f12b4.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://wukefomirufiza.rf.gd/pezin.pdfIn PDF document text
    • http://zerekigukazaja.epizy.com/happy_birthday_flowers.pdfIn PDF document text
    • http://pufawalaxovosi.epizy.com/10597379923.pdfIn PDF document text
    • http://ravuxigud.epizy.com/87978663722.pdfIn PDF document text
    • http://tagetebaj.rf.gd/add_admob_ad_in_android.pdfIn PDF document text
    • http://porokeziz.rf.gd/bamthathile_song_fakaza.pdfIn PDF document text
    • http://tawuzosidekelos.epizy.com/contactor_wiring_guide.pdfIn PDF document text
    • http://gulavofi.epizy.com/36158572870.pdfIn PDF document text
    • http://gipenebome.epizy.com/samir_aouchiche.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_off00010263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10263 5144 bytes
SHA-256: c357ebb04517b754181d8a2cdb14231f9bc8a815b09224ce294ba5579073648b
font_01_sfnt_off000113c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C3 10692 bytes
SHA-256: efe03320d3cc476ab81f76d185b7daf5960fcfee2a46dbd1a76985d856a180c6
font_02_sfnt_off00013835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13835 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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