Malicious PDF — malware analysis report

Static analysis result for SHA-256 d113524755f3cc3a…

MALICIOUS

PDF

75.2 KB Created: 2021-04-08 08:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e4679632f0ea84924a481f2ca9be1f5d SHA-1: 02a41ae0b617fbaa4bb4cfc29eb4467da05802ff SHA-256: d113524755f3cc3a1ca1969f3deb53917d9ec25d73fe01a66ff45c251c4fe3c9
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation. The embedded links point to various PDF files hosted on disposable or unknown domains, suggesting a campaign to distribute content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cdn-cms.f-static.net/uploads/4480174/normal_603e23e67538c.pdf In PDF document text
    • https://puxasuzad.weebly.com/uploads/1/3/4/3/134352875/posadava_kigugikujumimav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378606/normal_602809fc86b1c.pdfIn PDF document text
    • https://kesiwupi.weebly.com/uploads/1/3/1/4/131407351/9686320.pdfIn PDF document text
    • https://cdn.sqhk.co/vutazekerubu/ejf5Mbz/smart_car_charger_type.pdfIn PDF document text
    • https://duvetuxivana.weebly.com/uploads/1/3/3/9/133999993/a6b27cb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426422/normal_603a6ad63b8d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453326/normal_5ff2167b2c75a.pdfIn PDF document text
    • https://cdn.sqhk.co/vedasukuki/ihchiLQ/makewaruxixok.pdfIn PDF document text
    • https://cdn.sqhk.co/reromiwo/jaibzih/how_to_use_vocal_pitch_monitor_app.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/mJjesid/seesaw_family_app_qr_code.pdfIn PDF document text
    • https://tisawisapapaw.weebly.com/uploads/1/3/5/3/135326074/fivafofidu_jugubalegod_bikelan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466172/normal_604f49e752669.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/gggfnmi/taxanagarewulenanidivosak.pdfIn PDF document text
    • http://detomebokiv.iblogger.org/latest_tv_advertisement_video.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420250/normal_606e286a281aa.pdfIn PDF document text
    • http://radewilagimalap.iblogger.org/vebutelodupugate.pdfIn PDF document text
    • https://cdn.sqhk.co/jadizefon/hcfbejj/97275524853.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/jJyWpsOf3IE/wb?keyword=dnd%205e%20arcane%20tradition%20featurePDF link annotation
    • http://tezafafowajij.epizy.com/fufojijil.pdfIn PDF document text
    • http://gagoxapedako.epizy.com/giwegix.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_off0000e9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FF 4928 bytes
SHA-256: 10ba3e462e0ad4ae55deefeaccd9260228737defdab85cccdc8797d34d89780a
font_01_sfnt_off0000fae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE0 10860 bytes
SHA-256: 50e194ebea787d74a0bee5b32410f3f61c6f29e8fce6c77f07fe6b76e6c77b80