Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ccb284318e94048…

MALICIOUS

PDF

74.9 KB Created: 2021-04-01 11:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: aa1a0447fee0226481c5d33492365970 SHA-1: e30d8916396cf9247ace089607dd77aab1cd8006 SHA-256: 8ccb284318e940480e24419ac667f3d3a6aa690a1a281c53f15f7aa441dfe8cf
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 of which point to other PDF files hosted on disposable or potentially malicious domains. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/wix?keyword=33+peachtree+place+ne PDF link annotation
    • https://cdn.sqhk.co/xaleteser/gstGIgi/2134445118.pdfIn PDF document text
    • https://cdn.sqhk.co/rogenujudita/gdhaMhe/dead_wallpaper_aesthetic.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/fjdieZy/avengers_coloring_games_free_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460447/normal_6038d566b5fa9.pdfIn PDF document text
    • https://kuritemu.weebly.com/uploads/1/3/1/3/131383398/lixinijupo-nibogil.pdfIn PDF document text
    • https://zusiwujewanu.weebly.com/uploads/1/3/6/0/136054437/raveresigoburul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463565/normal_605e156036eef.pdfIn PDF document text
    • https://cdn.sqhk.co/podoxato/hbHjbjj/80_s_house_music_list_songs.pdfIn PDF document text
    • https://fisujokogawubi.weebly.com/uploads/1/3/2/7/132711991/8707477.pdfIn PDF document text
    • https://cdn.sqhk.co/bulixanejad/8lkyuep/bebofuvisikuvoximef.pdfIn PDF document text
    • https://peliretoru.weebly.com/uploads/1/3/3/9/133997281/807232.pdfIn PDF document text
    • https://pajilolupifi.weebly.com/uploads/1/3/2/3/132302794/8bc2c7d22eac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479942/normal_5fed1efff1a42.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d7bf8fd7-63eb-43e6-9362-0c6f0c03655f/72645639545.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/samsung_s10_5g_camera_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/50742976439.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78ed380c-399b-4935-abb5-c3c8e3780883/culinary_arts_lesson_plans_for_high_school_students.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/manual_samsung_galaxy_tab_a_sm-t580.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/gubatobanugupoxasaj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4A 4544 bytes
SHA-256: bc3f52ad089e7a55c5b7104cec20cb83a973ac7edabc14137cd867b0df6f6ba1
font_01_sfnt_off0000e99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99C 11176 bytes
SHA-256: f2ef0c58682e64d5e818a3167f1040ba6ba4e787e1b7574b8aaf34e4e81c7807
font_02_sfnt_off0001100c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100C 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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