Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d8770487057c51c…

MALICIOUS

PDF

110.4 KB Created: 2021-04-07 00:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 68996bfb08cef80d876d22244929c125 SHA-1: 224b97e1b9101bd76a2fc3f3d920b4122149022c SHA-256: 0d8770487057c51c94fdf2f5e98acb7461a444fa040db185bf315c66f9d52d93
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 pointing to other PDFs hosted on disposable domains, indicating a link farm or SEO manipulation scheme. ClamAV and ML classifiers identified this file as malicious, specifically a phishing trojan. The embedded URLs suggest a phishing or malware distribution attempt, potentially using the document as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://golowaki.ru/strik?utm_term=baby+bjorn+toilet+seat+uk PDF link annotation
    • https://gofubemasuxa.weebly.com/uploads/1/3/2/7/132712405/85b17673d5e5e5.pdfIn PDF document text
    • https://cdn.sqhk.co/pomorezolo/OW2g9ji/sword_art_online_season_3_netflix.pdfIn PDF document text
    • https://cdn.sqhk.co/pubamegumox/gjgCgfp/40337307874.pdfIn PDF document text
    • https://cdn.sqhk.co/definuseju/mROAhgN/the_maze_runner_book_review_goodreads.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxobenona/1b2Mzoh/kotodobir.pdfIn PDF document text
    • https://supavutoni.weebly.com/uploads/1/3/4/7/134713891/8f31ab.pdfIn PDF document text
    • https://webakutukulufu.weebly.com/uploads/1/3/2/6/132683024/06a1e9e6e.pdfIn PDF document text
    • http://gusebozaromurel.mypressonline.com/wuxikiro.pdfIn PDF document text
    • http://gufurebu.medianewsonline.com/norelco_series_9000_shaver_9500.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450625/normal_5ff2be71487a2.pdfIn PDF document text
    • https://gadogirunen.weebly.com/uploads/1/3/5/3/135347667/ad8d9c98ec10f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404116/normal_6068708a7c034.pdfIn PDF document text
    • https://cdn.sqhk.co/xokebuzizo/Cjbmjjd/create_animated_stickers_for_whatsapp_iphone.pdfIn PDF document text
    • https://lewobagapu.weebly.com/uploads/1/3/4/6/134666085/3830088.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/hdDFuOV/paytm_mobile_recharge_offers_jio.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1ee34b3e-bfcb-4e25-b227-79ffd44eef10.filesusr.com/ugd/9d5096_e65c10de161c4ecbb9b4e64d37becee1.pdf?index=trueIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_c912528ebfff4e31b53af159ee0abced.pdf?index=trueIn PDF document text
    • http://positajugopisu.myartsonline.com/59307895570.pdfIn PDF document text
    • https://b0b89e74-75d6-43b0-bb8f-fa2cd9bd5f5b.filesusr.com/ugd/b5ae3e_31ca871564bb4434abb6a2c0fc5dddb9.pdf?index=trueIn PDF document text
    • http://mipagolawalixa.onlinewebshop.net/revaxivonigujozupugus.pdfIn PDF document text
    • http://badamowafe.onlinewebshop.net/84665912365.pdfIn PDF document text
    • https://d2ffd92d-ad89-4e9b-8359-126286817a3c.filesusr.com/ugd/dd9784_e238850535ca4db89b7e24169453e74d.pdf?index=trueIn PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_2d7ee8c408c54c638fbb1bcd09e487f9.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_off0001751b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1751B 5112 bytes
SHA-256: ff543cb94df9ca9a1a4ed2010b8ab39f39ea381c2098fa658eef53d44ebe7039
font_01_sfnt_off00018699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18699 11080 bytes
SHA-256: 6160d8d50f6fe63ff070ba6506a68889016421f51e614bcce68828b5be7a71a9