Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ace78503103b2c2…

MALICIOUS

PDF

73.5 KB Created: 2021-01-06 09:03:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1e9f89aed14e118cfc8561923c23f755 SHA-1: cddf351581cd1261183479cb5acd882fcf06eedd SHA-256: 4ace78503103b2c26bd31a41fab443a5b5482230776d34959eba64f459147170
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external links suggests an attempt to lure users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://traffmen.ru/123?utm_term=fsa+headset+assembly In PDF document text
    • https://cdn.sqhk.co/sijiposago/JgdNgeJ/22431939613.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/j1GRjcL/origami_star_box_diagram.pdfIn PDF document text
    • https://wowemaba.weebly.com/uploads/1/3/1/3/131380083/2298127.pdfIn PDF document text
    • https://cdn.sqhk.co/mibolujo/8rhcrjh/zawajarupazivuva.pdfIn PDF document text
    • https://cdn.sqhk.co/nijusukelok/sibNjjJ/pocket_mine_2_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/waximanodif/hbNItge/87501957611.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pegebunov/babylon_a._d_full_movie_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/517341f3-9ee7-471f-a9d3-699cdf064eaf/manual_blood_pressure_monitors_for_home_use.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/sites_google_music.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/wikur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6291705f-a310-407f-9956-f6743cdc3b66/36485237115.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69ff5bde-26c0-4917-97ac-db8a059deeee/31791080704.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/3d_character_creator_program_free.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD785 3312 bytes
SHA-256: 59495b2904df561cd942e0e22365fc541593ae2e1948b798e38bad1a0989186f
font_01_sfnt_off0000e371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE371 5168 bytes
SHA-256: 88a4d8ab72200296bd0f6614aadbf07730b2ec6709d32ea68a9a644da4d6d754
font_02_sfnt_off0000f4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E4 10456 bytes
SHA-256: e4524df66317845c4c1e5d4598f5a36eebd1c0a03e3fd647b50a35d9e047f294

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