Malicious PDF — malware analysis report

Static analysis result for SHA-256 041474573b92a379…

MALICIOUS

PDF

77.4 KB Created: 2021-02-23 18:59:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 57bfbc7ec62e878d7409914215ef75f9 SHA-1: 3c1ed702548e44a0d8bbe85ccf6a7569401c7417 SHA-256: 041474573b92a3796ba9bd044148c4d83927f9af92611fc59669f913aded1ef6
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm, indicating a phishing or SEO spam campaign. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the embedded URLs are the primary indicators of malicious intent, likely leading users to malicious websites.

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
  • 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://crophysi.ru/123?utm_term=what+temperature+is+too+cold+for+pouring+concrete In PDF document text
    • https://cdn.sqhk.co/nuroteditu/gd6iajg/homemade_face_mask_for_blackheads_and_pimples.pdfIn PDF document text
    • http://smcjd.com/rudupefvbkoy.pdfIn PDF document text
    • https://xisuludibu.weebly.com/uploads/1/3/5/3/135300694/3186081.pdfIn PDF document text
    • https://cdn.sqhk.co/nufesewepi/hjjgjjh/70598450169.pdfIn PDF document text
    • https://cdn.sqhk.co/jenotonolo/clRjdgc/b-_52_bomber_used_in_vietnam_war.pdfIn PDF document text
    • https://rofunepez.weebly.com/uploads/1/3/2/7/132710772/zosudimanaguvaketosu.pdfIn PDF document text
    • https://fogorito.weebly.com/uploads/1/3/5/3/135322632/1598711.pdfIn PDF document text
    • https://cdn.sqhk.co/nujudemugipi/rRwhehe/gonaviwe.pdfIn PDF document text
    • http://servisvds.ru/fukafukunujaxuperadalass098.pdfIn PDF document text
    • http://minuette.me/19448870097d21ua.pdfIn PDF document text
    • http://1offpark.xyz/cr_consumer_reports_phone_numbercpvig.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/wakuzidi/new_album_dj_remix_song.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/dremel_3000_rotary_tool_kit.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_off0000f0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D1 5580 bytes
SHA-256: 9220916cbc0561cf22bc45e126b3ccf1159e54b0643867c4508e298503812a31
font_01_sfnt_off000103b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B0 10692 bytes
SHA-256: 689db4a5edf0d8af9cb52dbd8b9da4abcb819a29f9030c573d4a013a30eb32d6

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