Malicious PDF — malware analysis report

Static analysis result for SHA-256 691732f6afacc890…

MALICIOUS

PDF

124.9 KB Created: 2021-03-09 10:02:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2367606a44e1c97a1223af0f9f88dd1e SHA-1: d7db9846dc3603a653739e80f3feed6321700306 SHA-256: 691732f6afacc8907fded3793ad1066f64bf7358bc3d8609ff1f43323d633771
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=old+school+country+music+hits PDF link annotation
    • https://nalatuzub.weebly.com/uploads/1/3/4/3/134324595/4838133.pdfIn PDF document text
    • http://resimpub.com/762649604270hweo.pdfIn PDF document text
    • http://fsbsiod.com/can_you_get_google_earth_in_real_timeagkyu.pdfIn PDF document text
    • https://fuxiwajusefu.weebly.com/uploads/1/3/4/6/134617271/9117094.pdfIn PDF document text
    • https://vinenuji.weebly.com/uploads/1/3/1/4/131453259/4381d24171.pdfIn PDF document text
    • https://gefobivuvevu.weebly.com/uploads/1/3/1/3/131380717/93c2f7802.pdfIn PDF document text
    • http://lituxupov.iblogger.org/casio_alarm_chrono_wr_lithium.pdfIn PDF document text
    • https://fekebejoluxoji.weebly.com/uploads/1/3/4/3/134309121/jukumaj.pdfIn PDF document text
    • https://dikozawurizid.weebly.com/uploads/1/3/1/6/131637316/danoxa-zegowuvawel-revubimifal.pdfIn PDF document text
    • http://polikarmonolit.ru/96458082466n05nx.pdfIn PDF document text
    • http://ourfutures.space/munafik_2_downloadon5b0.pdfIn PDF document text
    • http://mixit.info/92774387421c5buy.pdfIn PDF document text
    • https://vozozexofevufut.weebly.com/uploads/1/3/1/8/131871902/5608145.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tasefabomodewiv.epizy.com/nevewixobevido.pdfIn PDF document text
    • https://a49a6154-edc8-4132-95a2-c7bb8d673fe9.filesusr.com/ugd/551169_64e1cdba3f36498791f136721ab91b4e.pdf?index=trueIn PDF document text
    • https://b2f3f1fb-4f3f-4d5d-be65-f5b10dce6288.filesusr.com/ugd/735189_0ca18f6ea6884eaba91224e92aa818d7.pdf?index=trueIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_44fe50d1f03d4d98bfbc38e51285a846.pdf?index=trueIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_203dedbfd8e948c9a413847951da29b9.pdf?index=trueIn PDF document text
    • http://bivoxubi.epizy.com/66689029519.pdfIn PDF document text
    • https://a9f3490c-def6-45ea-9957-aefa341d54bd.filesusr.com/ugd/84b587_e81a1058a36a4accbcf4fd437771519d.pdf?index=trueIn PDF document text
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_ef79135d83ae419c9ad104a92ccd098f.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ad92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD92 5100 bytes
SHA-256: b61770d9f51581a48c79734c2ac2164038e7d99b1b103a56759ec0f975dee1e6
font_01_sfnt_off0001bec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEC4 11732 bytes
SHA-256: 8e7d5c04b8d51b361e58716afe301f05b94eafe573fc1f93a97b7875e75fa489