Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac12eef0f45cd426…

MALICIOUS

PDF

84.1 KB Created: 2021-02-21 12:05:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9499afcc6c4d3474d83298af11318fd3 SHA-1: a9f62c842fc959ed1426328d245ae4d0c485e9eb SHA-256: ac12eef0f45cd4262fcabe42faa7fde24e65716e79f4c4411e69a791dfb9376b
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to disposable domains or redirectors, indicating a link farm or phishing lure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure. While no scripts were extracted, the structure and URL patterns strongly suggest an attempt to redirect users to malicious content, likely for phishing or SEO manipulation purposes.

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
  • 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.
  • 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.
  • 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://yafferge.ru/strik?utm_term=eclipse+mp3+manual+fit+clip+plus In PDF document text
    • https://cdn.sqhk.co/wifukatar/iguOgci/world_of_bingo_hack_apk.pdfIn PDF document text
    • https://xekawipafamut.weebly.com/uploads/1/3/4/3/134328312/7721619.pdfIn PDF document text
    • https://cdn.sqhk.co/zisubiziwu/abYigie/origami_box_instructions.pdfIn PDF document text
    • https://cdn.sqhk.co/wajuletixex/ECjijg1/76155423298.pdfIn PDF document text
    • https://cdn.sqhk.co/jefutubup/i0ghihi/53599708587.pdfIn PDF document text
    • https://bifekanivixu.weebly.com/uploads/1/3/1/4/131408854/2647808.pdfIn PDF document text
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/xepesamewateli-jamol-xibajuvajiw.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/jfhaUji/spider_solitaire_game_free_download_for_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/fisoxinizo/zgfjfRk/stomach_cramps_meaning_in_urdu.pdfIn PDF document text
    • https://fivitilanafime.weebly.com/uploads/1/3/5/3/135395402/14d4c05b616b.pdfIn PDF document text
    • http://extraterrestrials.space/positive_mind_control_techniques0xdfl.pdfIn PDF document text
    • https://cdn.sqhk.co/marixefe/hiieZWu/bigimuwatebumepu.pdfIn PDF document text
    • https://pasorizafam.weebly.com/uploads/1/3/4/0/134096756/jevibigu_vebibutejetoto_rigam.pdfIn PDF document text
    • https://fofifakexetag.weebly.com/uploads/1/3/4/3/134345684/nosasufiwok.pdfIn PDF document text
    • https://fefugenaxidoseb.weebly.com/uploads/1/3/1/3/131380158/dovuvirak.pdfIn PDF document text
    • https://gazekusiparisom.weebly.com/uploads/1/3/4/0/134012522/455788.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/bisiku/sudopexu.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/3261120163.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/amadeus_flight_information.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/33765559278.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_off00010a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4B 5188 bytes
SHA-256: 8e2c094d3a82ff9d5ab3130e7b8840f01b5013ea217d50b7d439b8626f5103ec
font_01_sfnt_off00011be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE7 11980 bytes
SHA-256: 085281745d097ce09029ed7bbde29d189b3c9875ef2c4d8d5f38893452ea82d9