Malicious PDF — malware analysis report

Static analysis result for SHA-256 2040303c8766b597…

MALICIOUS

PDF

77.1 KB Created: 2021-06-10 23:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: bbc2bd75b13afd9ecc14b86332f8d149 SHA-1: 688e7cf2d512f2a3546cb5818f31f04401adeff2 SHA-256: 2040303c8766b5970b435c02766b5b1cadd03d55049c1b258e97226abdd5bb31
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple critical heuristics as a malicious redirector and a link farm. It contains a large number of embedded URLs pointing to various external PDF files, many hosted on disposable domains or known redirector infrastructure. The ML classifier and ClamAV also identified this file as malicious, suggesting a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=businessman+movie+songs+free++in+telugu In PDF document text
    • https://samarobiratepiw.weebly.com/uploads/1/3/5/3/135327643/rekiterowepozef_jadawefebesi_fanirulu.pdfIn PDF document text
    • https://guxiwuwo.weebly.com/uploads/1/3/1/0/131070036/7057979.pdfIn PDF document text
    • https://bimipesetasezi.weebly.com/uploads/1/3/4/0/134017520/6433864.pdfIn PDF document text
    • https://letitelow.weebly.com/uploads/1/3/4/5/134500939/7038376.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471082/normal_5fdeaa43852c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453326/normal_5fd8fd9f74841.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446398/normal_60279eba0a0d3.pdfIn PDF document text
    • https://warefoboba.weebly.com/uploads/1/3/4/6/134669172/wujamiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410015/normal_6049a3f7888f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415077/normal_603067913d794.pdfIn PDF document text
    • https://foboxujegi.weebly.com/uploads/1/3/4/6/134694162/ruxigunis-leditovimo-kuvesafimufok.pdfIn PDF document text
    • https://zosekofafome.weebly.com/uploads/1/3/4/5/134595162/nukemavidogusu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402501/normal_605acdc685da5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402722/normal_605c708603cce.pdfIn PDF document text
    • https://kuvopesi.weebly.com/uploads/1/3/2/3/132303138/feposefofej.pdfIn PDF document text
    • https://vuxuminitemup.weebly.com/uploads/1/3/0/8/130874085/d9bf3af1edc5d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rutarotovez.pbworks.com/w/file/fetch/144869583/price_is_right_losing_horn_button.pdfIn PDF document text
    • http://niraxaba.pbworks.com/w/file/fetch/144892392/shadow_fight_2_god_titan_mod_apk.pdfIn PDF document text
    • http://nikekuva.pbworks.com/f/cambridge_secondary_checkpoint_past_papers_2020_october_english.pdfIn PDF document text
    • http://xugilip.pbworks.com/w/file/fetch/144909408/paladin_healer_wow_classic.pdfIn PDF document text
    • http://jajafad.pbworks.com/f/wilowakasadur.pdfIn PDF document text
    • http://sajateves.pbworks.com/w/file/fetch/144462726/kajavixijanodakajeji.pdfIn PDF document text
    • http://josinibugaju.pbworks.com/w/file/fetch/144819360/petozejuvubetujubajasosen.pdfIn PDF document text
    • http://rorazokazog.pbworks.com/w/file/fetch/144695649/povibiferokagumidafozi.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_off0000ef73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF73 5196 bytes
SHA-256: 881283cdd429394d476202e15a1438e3e751e5fd99981d4d2a27e3f0f6ba776d
font_01_sfnt_off00010114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10114 11168 bytes
SHA-256: c2945bbbe26fff7d21552a909b78044664abc9a0bd8af8cc73303427a7b48c4e