Malicious PDF — malware analysis report

Static analysis result for SHA-256 5561e6f097de4d27…

MALICIOUS

PDF

79.4 KB Created: 2021-03-13 21:13:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 12c76fad26ab245496028bfd656149f4 SHA-1: ee2617ad6c010da9e0d448f2e36c26e65c0992dd SHA-256: 5561e6f097de4d270cb46cfc53162949c3acd16ab7245716ae7b071fd14f2164
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a large number of external links, including a link farm on disposable hosting, suggests a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to lure users to malicious sites.

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://lozipotod.ru/award?keyword=cuento+almohadon+de+plumas+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369781/normal_5fd5f3ab08341.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454694/normal_5fe7d387ac899.pdfIn PDF document text
    • https://wedutigumufezeb.weebly.com/uploads/1/3/4/6/134659425/dowetosom_pilosukoriwese_zonetuja_vubufuzo.pdfIn PDF document text
    • http://fodamibokaf.66ghz.com/25196627480.pdfIn PDF document text
    • https://cdn.sqhk.co/sitopizol/dF4unxT/best_microphone_for_iphone_11_pro_max.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374839/normal_602f2b1fbd3fc.pdfIn PDF document text
    • https://cdn.sqhk.co/monasomeb/rhdjiSe/sun_mountain_mc3_golf_micro-_cart.pdfIn PDF document text
    • https://watoniworawi.weebly.com/uploads/1/3/4/8/134871767/maturo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402718/normal_602edc8815dff.pdfIn PDF document text
    • https://cdn.sqhk.co/pugepavofu/IjeNief/pijejaberida.pdfIn PDF document text
    • https://cdn.sqhk.co/resilano/wVvigTW/at_t_u_verse_customer_support_24_7.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/fEnVpji/46896838807.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366005/normal_5fd32853d4338.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kofufinaniba.rf.gd/how_do_i_get_a_mobile_food_vendor_license_in_florida.pdfIn PDF document text
    • http://foburug.rf.gd/who_voices_ryuk.pdfIn PDF document text
    • http://finuponazed.epizy.com/the_dream_of_a_common_language_amazon.pdfIn PDF document text
    • http://jetubomubiko.epizy.com/angle_bisector_practice.pdfIn PDF document text
    • http://kopunojode.rf.gd/sowojapuxenuwaka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94d7b088-31a1-4f29-ac65-b2f879e7f139/71767685636.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_off0000f576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF576 5088 bytes
SHA-256: 841d5b74014cc7553ab1168619bf8020c59fbc8f4fb8072335cb375f32073446
font_01_sfnt_off0001069f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069F 12512 bytes
SHA-256: 94f43cdd86398cbd818e52e378da770b8fa0cd56b5f366708337d33364d5faa3

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