Malicious PDF — malware analysis report

Static analysis result for SHA-256 d32d14a223a95abc…

MALICIOUS

PDF

78.2 KB Created: 2021-06-14 08:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 571fd561b9f882f02c2c00f932b08fd0 SHA-1: 7bf2412f619d2491cdf921219fd3138ecaf626ab SHA-256: d32d14a223a95abc1ac0e97a9f4d2e44b07bee06fd752bec8cd94a4d7724f8a8
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external URLs under the guise of providing interview-related content. The PDF_SEO_LINK_FARM heuristic indicates a high volume of outbound links, many hosted on disposable domains, suggesting a phishing or scam attempt. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm strongly suggest an intent to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://crysiq.ru/pbw?utm_term=algorithm+interview+questions+and+answers+pdf PDF link annotation
    • https://vonorakukipi.weebly.com/uploads/1/3/4/7/134721252/7032627.pdfIn PDF document text
    • https://gebigimudixerez.weebly.com/uploads/1/3/4/3/134374499/5262056.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388040/normal_605f63189c1d5.pdfIn PDF document text
    • https://bizupuligal.weebly.com/uploads/1/3/4/6/134603830/5771d7a22c2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423452/normal_60346395c5b54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458833/normal_5fe63edc78c48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371787/normal_601a5208e25f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389824/normal_6053b226ea9d4.pdfIn PDF document text
    • https://jejaxome.weebly.com/uploads/1/3/4/4/134443668/5266913.pdfIn PDF document text
    • https://pafirovax.weebly.com/uploads/1/3/4/6/134662293/3d0d053.pdfIn PDF document text
    • https://sivagodumojuji.weebly.com/uploads/1/3/4/2/134235915/3ed0d33ea06ee85.pdfIn PDF document text
    • https://lavidibiw.weebly.com/uploads/1/3/4/5/134582964/9415701.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416932/normal_5ffa01271581f.pdfIn PDF document text
    • https://vilabusifa.weebly.com/uploads/1/3/0/7/130776169/df2cba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421787/normal_6054fce4b80df.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://tarogifere.pbworks.com/f/wulojowuwotote.pdfIn PDF document text
    • http://rukuvekuke.pbworks.com/w/file/fetch/144843636/95970444813.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92f1e08a-d7a7-4803-9bd9-01795c0442f3/56336043523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1effe950-c40c-4673-ad69-b680f753a359/ruwirotuzivoxodagijino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87fde192-f8d1-4e8f-b328-f3b7c60ba6ce/alcoholics_anonymous_meetings_winston_salem_nc.pdfIn PDF document text
    • http://fotikeralo.pbworks.com/w/file/fetch/144446880/how_to_franchise_kung_fu_tea.pdfIn PDF document text
    • http://zatesil.pbworks.com/w/file/fetch/145140633/best_site_to_download_pirated_books.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_off0000e618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE618 5604 bytes
SHA-256: 3a231038f6eadcbf6d1868ee04415dbbbd0bc62d20821411754d65911c2e3d44
font_01_sfnt_off0000f909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF909 10544 bytes
SHA-256: 5d756cbcbf3d1e608062d2c14e12f65973f0b4cbe78d77bfb44f15c0f11e4b0f
font_02_sfnt_off00011d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D07 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361