Malicious PDF — malware analysis report

Static analysis result for SHA-256 909b7dedf45a4a95…

MALICIOUS

PDF

79.8 KB Created: 2021-02-20 16:07:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 93bf4f9b487104f80dd351e5f9e17eb5 SHA-1: b215e317391db5da54ee28462cc55e6c519ac64b SHA-256: 909b7dedf45a4a95235f68b183cac078d2b396145c102957968536e91dcc06a1
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The document body, though obfuscated, appears to be a lure related to "Kidde smoke detector blinking red and green", suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

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
  • 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://crophysi.ru/wb?keyword=kidde%20smoke%20detector%20blinking%20red%20and%20green In PDF document text
    • https://static.s123-cdn-static.com/uploads/4426942/normal_5fe2424302f9c.pdfIn PDF document text
    • https://roxasunuveju.weebly.com/uploads/1/3/1/4/131437516/xotezopukasazegikan.pdfIn PDF document text
    • https://tamilifikex.weebly.com/uploads/1/3/5/3/135321075/fenabomiruwisu_dunujo_vinideduvejur.pdfIn PDF document text
    • https://relotevifinedu.weebly.com/uploads/1/3/2/6/132683264/toxorugebexuteniji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421477/normal_5fef346355318.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444095/normal_6026650047a54.pdfIn PDF document text
    • http://zazuvivilug.iblogger.org/80530683259.pdfIn PDF document text
    • https://figusemaf.weebly.com/uploads/1/3/2/6/132682639/xobefetafovawi.pdfIn PDF document text
    • https://cdn.sqhk.co/lewoxiguj/Vjaqcjg/chinese_checkers_rules_stalemate.pdfIn PDF document text
    • https://jelebemurufipo.weebly.com/uploads/1/3/4/4/134442628/6a047bd5.pdfIn PDF document text
    • https://zibozofos.weebly.com/uploads/1/3/4/8/134896422/takenokegume.pdfIn PDF document text
    • https://duvozeja.weebly.com/uploads/1/3/0/7/130739152/mozawi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zaxigadanu.rf.gd/sandisk_8gb_clip_sport_mp3_player.pdfIn PDF document text
    • http://vogufobitag.epizy.com/kogudefidupiwebop.pdfIn PDF document text
    • http://pinogizege.rf.gd/kanelomuruxin.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_off0000f9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B8 5432 bytes
SHA-256: 74f8a3ce6242bfe11d14184189159ed8d42da3096b3b9aa4b6bca82e248ad76f
font_01_sfnt_off00010c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C19 11320 bytes
SHA-256: 02f672176a41eb8f867b640540347cd4baaa968ecfc3a578f12cc7949beda017

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