Malicious PDF — malware analysis report

Static analysis result for SHA-256 e572c7e782b1f692…

MALICIOUS

PDF

83.3 KB Created: 2021-05-29 06:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 2cd19284131c2c30d1b19dd9ef1ca3d0 SHA-1: 43a6e3872f0d1276a7714b6908cdc74621cfb3bb SHA-256: e572c7e782b1f692092d39b92b7f6b362ea6ed51deb676b5d48c8e5aaeda07e5
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of external links, many pointing to disposable domains, suggesting it functions as a link farm. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate the primary goal is to redirect users to potentially harmful external sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/123?utm_term=floppy+phonics+worksheets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391305/normal_60547449a14ca.pdfIn PDF document text
    • https://nudidilekeluxi.weebly.com/uploads/1/3/4/3/134384451/3353051.pdfIn PDF document text
    • https://femomupine.weebly.com/uploads/1/3/4/4/134458898/nodepifaxarogu-zixiwevojagel.pdfIn PDF document text
    • https://bidiguregila.weebly.com/uploads/1/3/4/7/134700143/kuxivizuw_nuwijisiluzine_gotokoke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451027/normal_604ebc2ec6bc5.pdfIn PDF document text
    • https://nogenovone.weebly.com/uploads/1/3/4/7/134745979/0c1d46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385235/normal_5fe81739026fd.pdfIn PDF document text
    • https://filavemegu.weebly.com/uploads/1/3/4/8/134883773/fapun_falemaledox.pdfIn PDF document text
    • https://kujepilam.weebly.com/uploads/1/3/5/3/135343620/gunepozusizad-derigifagesup-tosijeko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482215/normal_6026a1d5602e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465705/normal_604b28f89df35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417313/normal_601b3ab43cd5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408981/normal_606b18f127eaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458839/normal_605d809389fde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416322/normal_602ce23528820.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446283/normal_5ff3bfddeb985.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393362/normal_5ffd02fb39ead.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485156/normal_60544ed0b70f4.pdfIn PDF document text
    • https://tekerigaxigo.weebly.com/uploads/1/3/4/7/134702693/a237ecd.pdfIn PDF document text
    • https://lenagalazipanom.weebly.com/uploads/1/3/5/3/135310064/296048.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489259/normal_5fe25975baf13.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/92448c57-a986-41cc-af97-025bb6a0ddc9/just_2_words_level_1403.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e87b0fe1-4464-4104-a506-061814ac556c/genero_narrativo_ejemplos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1edab1f-12be-4be1-9d4e-e2d0c3c79456/goliath_must_fall_session_1.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DF 5024 bytes
SHA-256: a7d0b4ef03156824e484fd82302e51394d228f4a9764dff50bf2acd97bcc5490
font_01_sfnt_off0001050e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050E 11048 bytes
SHA-256: 7d82faa661908dbb16430dbe3d4cfa923f7e2720fd88af1f4a4af069c7ad24c8
font_02_sfnt_off00012b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B11 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90

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