Malicious PDF — malware analysis report

Static analysis result for SHA-256 bea1ea333ccbce77…

MALICIOUS

PDF

79.6 KB Created: 2021-03-18 20:15:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cbb66f0ead95d633329d847801b9e54 SHA-1: 5b4e16543c84cf7e39a67fa92c2f917d6e8b9406 SHA-256: bea1ea333ccbce772ea8837fd2b41cf048dfa47590ab2b011644c3633a1ddbb3
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are dynamically generated and likely intended to manipulate search engine results for malicious purposes. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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
  • 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://vilenefex.ru/award?keyword=employment+certificate+sample+pdf
    • https://cdn.sqhk.co/pobumepova/ihxCBhd/up_faith_and_family_christmas_movies.pdf
    • https://tajaleder.weebly.com/uploads/1/3/5/3/135320318/5833947.pdf
    • https://cdn.sqhk.co/mojerakikav/2hczhiv/kazubatudoranilovuv.pdf
    • https://nasaperexi.weebly.com/uploads/1/3/5/3/135351481/pikowudiferur_zexub.pdf
    • https://puxipevabama.weebly.com/uploads/1/3/4/3/134308905/dojatosanonux.pdf
    • https://cdn.sqhk.co/bibunifez/08YJHgh/38002870008.pdf
    • https://cdn.sqhk.co/xegunorasu/hbjjKpc/dallas_cowboys_good_morning_quotes.pdf
    • https://cdn.sqhk.co/sakiforivona/hhajiic/timokodalagokifakejen.pdf
    • https://nanuleseja.weebly.com/uploads/1/3/4/0/134012971/buwitokinavogawen.pdf
    • https://cdn.sqhk.co/wisulekekij/iefibhi/47664882843.pdf
    • https://marademuwuzam.weebly.com/uploads/1/3/4/3/134396837/ragoxalebef-ralimugomebadil-rerominix.pdf
    • https://cdn.sqhk.co/jubawiwa/jiHghSp/3618455643.pdf
    • https://cdn.sqhk.co/zudoputasafe/xdrjeeS/25833967634.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://42f4b946-f871-4f2a-a73e-6571c6569919.filesusr.com/ugd/e20521_33aae1778fe244a79657c721ca89d269.pdf?index=true
    • https://590703a0-be71-4d3c-a49f-17767d5969ef.filesusr.com/ugd/656c20_cdbacb6474484e93a53102b445782657.pdf?index=true
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_e974b550372249eba9868d49e7de5c61.pdf?index=true
    • https://s3.amazonaws.com/bulozor/21466836665.pdf
    • https://s3.amazonaws.com/lezopobigeza/1140710604.pdf
    • https://0c6b2c5e-c852-454c-8c01-bea24f6181fd.filesusr.com/ugd/b97644_5bc9022afaae4cfeacd37bfe31f5ca43.pdf?index=true
    • https://s3.amazonaws.com/fovezewi/general_assembly_meeting_template.pdf
    • https://6593eeda-10fe-4128-810f-cbbc79f0a4f8.filesusr.com/ugd/c0a4bf_1314759adeb54c4584b217015292c4cd.pdf?index=true
    • https://s3.amazonaws.com/rerinago/jisokiwijavafisigukudutuk.pdf
    • https://s3.amazonaws.com/dazifozixawus/hawes_and_curtis_shirts_size_guide.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_off0000ec17.bin
cfd18d96e6b9f92cd28c983d4cb2ac3b296eaa9c23d4722be9b03f68d649f376
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC17 5148 bytes
font_01_sfnt_off0000fd80.bin
2198c5674877ea1ea8d6191d886463ef84929bd6a01109ecc6a47a0c4580ddba
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD80 10432 bytes
font_02_sfnt_off00012127.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x12127 4324 bytes