Malicious PDF — malware analysis report

Static analysis result for SHA-256 587d765e8d1d3572…

MALICIOUS

PDF

75.5 KB Created: 2021-04-07 23:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 160310dd3ec6c9ce20aba27ba0aa2441 SHA-1: f2cdfe919ed2b3802e684e868e23a1214678d13c SHA-256: 587d765e8d1d3572af6b3d44b7de6fa8a4302fdfe1321bf8b11aad7f4ce494bc
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily corrupted, contains a search query, indicating a lure to disguise the malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, likely for 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://druttle.ru/strik?utm_term=how+do+i+reset+my+motorola+droid+to+factory+settings PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381546/normal_606846f292ff6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390068/normal_6043ff7e3e864.pdfIn PDF document text
    • https://cdn.sqhk.co/niminililez/DhgwYjh/cat_live_wallpaper_lock_screen.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369514/normal_60011cf2955c8.pdfIn PDF document text
    • http://magnetfix.store/bncc_lingua_inglesa_ensino_mdio0c5aj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367305/normal_60512847a3103.pdfIn PDF document text
    • https://cdn.sqhk.co/fiporalisu/mXijkij/photo_collage_maker_collage_maker_photo_editor_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470020/normal_60336f6b55705.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410679/normal_5fc8c4650c0b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426090/normal_603428483f801.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476938/normal_5feba4efecd2e.pdfIn PDF document text
    • http://healthbeauty24.online/amsoil_dealer_price_listwu0or.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407304/normal_5ff026f26bd39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465548/normal_60076f100ace9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367290/normal_602e24ddce3da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402718/normal_6023022a05c04.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6b52f5a6-db44-4d3e-8337-ab33c729cb13.filesusr.com/ugd/f4de5e_37950a3daac845af9c7176194f987a26.pdf?index=trueIn PDF document text
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_0252ef91a1554c85bfda090796f7b367.pdf?index=trueIn PDF document text
    • https://a21785f5-e352-4c0e-a7c3-a232dca3c625.filesusr.com/ugd/3283b0_09f98f9676c24a39a44f1a4a6656c4e7.pdf?index=trueIn PDF document text
    • https://ebd157e6-94c3-4ff5-b3ab-516f87acbde6.filesusr.com/ugd/e87473_b137cba6f5ee44dfb8c5af4d21239598.pdf?index=trueIn 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_off0000e670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE670 5496 bytes
SHA-256: d22c03013a70b8423c643ea29127556b702a5ca173ec52bb36776694bebd0fe8
font_01_sfnt_off0000f921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF921 11088 bytes
SHA-256: 9571abb4f3e84b84efcb3cbefd469dce80418d15bed865f0ef79ad114d3841e6