Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e810b9f51175773…

MALICIOUS

PDF

76.6 KB Created: 2021-03-13 21:03:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fddc92e15875d60da7d5f6500ef4ad31 SHA-1: cb9a8c9db075bad19810a3012b109b3d8ac46f6a SHA-256: 7e810b9f511757731a3ff0ab4e1247a698b1be9e82af8eb608159622c3ea6806
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it functions as a link farm designed to redirect users to potentially harmful websites. The presence of URLs like 'https://bologen.ru/123?utm_term=chromecast+software++pc' indicates a possible lure for users searching for software, which could be a precursor to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/123?utm_term=chromecast+software++pc PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4458125/normal_5ffba0b4dbf35.pdfIn PDF document text
    • https://vilamewu.weebly.com/uploads/1/3/0/7/130775649/2aa91e63efb.pdfIn PDF document text
    • http://jofipifemu.medianewsonline.com/introduction_to_kinesics.pdfIn PDF document text
    • http://fupemagis.mywebcommunity.org/apprendre_a_ecrire_les_alphabets_franais.pdfIn PDF document text
    • https://fubomagasikeka.weebly.com/uploads/1/3/4/4/134474343/5f8cbf75c5cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474977/normal_60006881546d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448536/normal_5fda3087318cf.pdfIn PDF document text
    • https://gevotasi.weebly.com/uploads/1/3/4/3/134389209/duwumejolitivexuzaga.pdfIn PDF document text
    • http://wabiferofuvud.mygamesonline.org/cobra_walkie_talkies_microtalk.pdfIn PDF document text
    • https://toxosujaduwo.weebly.com/uploads/1/3/0/8/130874389/b6c85769.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472200/normal_5fe2bcf8bdbf7.pdfIn PDF document text
    • http://zimefob.22web.org/wadonokiwemonovevarizofe.pdfIn PDF document text
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/kadulemufodoke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b724dda4-e2e0-47c5-811c-ae3b7273578b.filesusr.com/ugd/a1e5ee_00e316a168e1495899592a1674785f39.pdf?index=trueIn PDF document text
    • https://68fdcf0a-b1f0-4758-9edf-48d2be6d990b.filesusr.com/ugd/ac51ce_590bba9ef72a415ca4d690e4b26a889e.pdf?index=trueIn PDF document text
    • http://fatijilipoto.epizy.com/disney_world_park_times_february_2020.pdfIn PDF document text
    • http://wudemexa.myartsonline.com/adobe_premiere_pro_price_one_time_purchase.pdfIn PDF document text
    • https://983c8978-ad56-435f-a988-47358aa6040c.filesusr.com/ugd/06a663_c0d73619b46748c2a4d9e0bc19d03997.pdf?index=trueIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_a33c84281930444eaec368e1ee206cf4.pdf?index=trueIn PDF document text
    • http://mubodadekutaxim.atwebpages.com/jopeluko.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAD 5220 bytes
SHA-256: 942f2ac6d613669ae22f033d529c35f4aa4ffe2efb2b7606138cf8016afdfefb
font_01_sfnt_off0000ff53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF53 11292 bytes
SHA-256: d021e615b0c36faeda90f47351d03d95bbff4de4c24af04338d6975457bd4b76