Malicious PDF — malware analysis report

Static analysis result for SHA-256 722d528a13f1d9cb…

MALICIOUS

PDF

134.8 KB Created: 2021-03-22 04:58:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 63875f95a039b6191f814cba2d3c7fe8 SHA-1: 8616204a83d846446abb3f212a2c0694d4e45b48 SHA-256: 722d528a13f1d9cbc4eb1cc8ef25e8bb5147f0678dc5187f51b2eb31bd4f4ba7
192 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/123?utm_term=android+tablet+installed+apps+not+showing In PDF document text
    • http://tamawasobo.sportsontheweb.net/46190798785.pdfIn PDF document text
    • http://luxisulejoxo.getenjoyment.net/irregular_verbs_list_a-z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427268/normal_5fed15adce21a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386852/normal_600a0e04a8d7a.pdfIn PDF document text
    • http://online-bestshop.xyz/tng_yu_piano_sheet9kgee.pdfIn PDF document text
    • http://porizaritofo.mypressonline.com/makaduvedofewomu.pdfIn PDF document text
    • http://andyhongdigital.com/worijilitaxuzakojuxobgl5o.pdfIn PDF document text
    • http://rilomenininun.getenjoyment.net/abnormal_child_psychology_7th_edition_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417659/normal_602ec05231046.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413013/normal_6054f50daa2b3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/059441b3-2652-4713-920f-e3e2868eae44/how_to_attach_chicco_car_seat_to_bob_stroller.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45a82aa0-6db7-4716-a5d1-ae17fce1291b/rofudemeborufinulukemizez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52cc004b-8abc-4023-8b70-7aafdbe9fd34/jotudajur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4518c101-663f-4fd5-be71-85c9c3b8b769/black_and_decker_leaf_hog_lh4500_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d434e48e-5535-4620-9d4e-f3825f1e5062/76987615530.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6be0f157-46f9-4982-b948-7f8b84573327/65658780013.pdfIn PDF document text
    • http://pimimozoji.myartsonline.com/jukulux.pdfIn PDF document text
    • http://jujobope.atwebpages.com/read_numbers_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4c5a33e-bc02-4d8f-bdff-acbc0ea9db77/hoover_elite_rewind_plus_reviews.pdfIn PDF document text
    • http://taroveruwidiba.onlinewebshop.net/hot_springs_vanguard_filters.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_off0001d3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D3BF 5444 bytes
SHA-256: edeccd868ed2f510d4e73171e69c57933b22005421449f1ba91ffa877b9f85ae
font_01_sfnt_off0001e647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E647 11800 bytes
SHA-256: 4ef52da3217607d346a235fabf7cb5bb2f9c2033e9a8373082f61f4d55db8dd2