Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1b3587bf676fa9…

MALICIOUS

PDF

76.5 KB Created: 2021-03-15 12:35:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0869db5995d4cae53ad0456ef396e1b5 SHA-1: 223bfe4a99bd4d19687f1719253c14d184728dc5 SHA-256: ef1b3587bf676fa90fd671eb4cec20db7baf4783f67dd7e5ea6e8072cfcae553
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm. The embedded URLs and the PDF's structure point towards a phishing or content-scraping scheme, potentially distributing further malware or leading users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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://fokemale.ru/123?utm_term=types+of+cables+in+computer+network+pdf
    • https://pojalizug.weebly.com/uploads/1/3/4/5/134591246/botujunajotefupo.pdf
    • https://wodanosivowifig.weebly.com/uploads/1/3/4/5/134593279/afd0358186490f.pdf
    • http://xiwupulo.medianewsonline.com/linoralivujevewirerof.pdf
    • https://cdn-cms.f-static.net/uploads/4459176/normal_602d2a7a43a42.pdf
    • https://retizobokeli.weebly.com/uploads/1/3/1/0/131070240/kubinafuzaw_jomoxekasuv.pdf
    • http://bekokax.getenjoyment.net/bosquejos_para_predicadores_tomo_2.pdf
    • https://cdn-cms.f-static.net/uploads/4403822/normal_602da9683e70f.pdf
    • https://cdn-cms.f-static.net/uploads/4466140/normal_6035be7ea0489.pdf
    • https://timonuwek.weebly.com/uploads/1/3/4/3/134383578/8307a5a.pdf
    • https://lixobanifalito.weebly.com/uploads/1/3/4/4/134443724/5588767.pdf
    • https://gegoviboz.weebly.com/uploads/1/3/4/8/134876631/227176e4.pdf
    • http://mufutekuson.getenjoyment.net/4798891188.pdf
    • https://porujeworor.weebly.com/uploads/1/3/2/8/132814718/6407827.pdf
    • https://popokafiri.weebly.com/uploads/1/3/1/4/131437291/bonitokeki.pdf
    • https://static.s123-cdn-static.com/uploads/4471682/normal_60025a1f100c6.pdf
    • http://xiruzox.mygamesonline.org/food_safety_temperature_chart_uk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_1810b7e949da44c293cf2978533d70df.pdf?index=true
    • https://s3.amazonaws.com/davolazupivowi/78609062.pdf
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_e81ef07996064cbdbeeaf5043ca405b4.pdf?index=true
    • https://s3.amazonaws.com/tenunud/89859264661.pdf
    • https://s3.amazonaws.com/jejulurowev/11523555842.pdf
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_79409c4f90ea4c06a6eb51f37f145732.pdf?index=true
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_c5857d2d2d2e45e3ac97933e2dd2f5d2.pdf?index=true
    • https://s3.amazonaws.com/tokatefozude/lee_county_florida_warranty_deed_form.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0bf.bin
360f2ba5f3c7dceac2f9c5d4fbb82c5dc81f7525c77d12772de353d054415a82
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BF 5532 bytes
font_01_sfnt_off0000f388.bin
7b7a1ba720864eeac7c176c05db351706685a2c1f38330ab52ebc8622746ea4a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF388 10048 bytes
font_02_sfnt_off00011618.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11618 4324 bytes