Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace57cb2b00b45a3…

MALICIOUS

PDF

68.5 KB Created: 2021-03-23 03:13:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16f5b350aed58703cdaf5ed9321806a8 SHA-1: 2e61eed9aaad8a03e79ba629ae37d06f55411157 SHA-256: ace57cb2b00b45a3e575b46bfc3a0216f24389323bb84c8760501428a516a184
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, identified as a link farm, with one prominent URL being resalured.ru. ClamAV and ML classifiers strongly indicate this PDF is malicious, specifically flagged as phishing and a trojan. The presence of embedded URLs and the link farm structure suggest the primary goal is to redirect users to malicious sites, likely for credential harvesting or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/123?utm_term=ayesha+ahmed+formals
    • https://cdn-cms.f-static.net/uploads/4374852/normal_600f4147680dc.pdf
    • https://cdn-cms.f-static.net/uploads/4454047/normal_602ea9f835098.pdf
    • http://idealicaitalia-ufficiale.site/deforestation_worksheet4qy7j.pdf
    • https://fejixugemab.weebly.com/uploads/1/3/4/6/134681032/6568572.pdf
    • https://zarimuxeve.weebly.com/uploads/1/3/4/8/134897304/foxilo_gubopadiv.pdf
    • http://tufuwavaziga.mygamesonline.org/pemem.pdf
    • http://ru-en.xyz/ferrari_california_t_for_sale_2017ee098.pdf
    • https://cdn-cms.f-static.net/uploads/4501503/normal_6014a2b492e82.pdf
    • https://cdn-cms.f-static.net/uploads/4384459/normal_6016d4ec2d30b.pdf
    • https://cdn-cms.f-static.net/uploads/4421466/normal_5fd671831cc4a.pdf
    • https://dikosunasalimob.weebly.com/uploads/1/3/4/3/134363034/sujesanab.pdf
    • https://ferugagesavisux.weebly.com/uploads/1/3/4/6/134687542/zedavalitasowurat.pdf
    • http://tarekupi.scienceontheweb.net/little_fires_everywhere_synopsis_episode_7.pdf
    • http://prizinsta365.site/44292110232hf94y.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tubupejevomo/jon_bon_jovi_live_concert.pdf
    • https://s3.amazonaws.com/wizakokowe/52241341897.pdf
    • http://vejebuta.rf.gd/dr_amit_goswami.pdf
    • http://ronojegev.rf.gd/kugededurovefovi.pdf
    • http://saxarivoje.onlinewebshop.net/animus_emma_jung.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d020.bin
b44beefcd81f536b67041fe79bf646f1fd34f239fcbac9989df4717b00e51873
pdf-font-stream PDF embedded font (sfnt) at offset 0xD020 5236 bytes
font_01_sfnt_off0000e1cd.bin
9a38713fad66b5f885fd15db02dc84c4913980651cd67216c914131137f4c859
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CD 10040 bytes