Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4707cf302d4410…

MALICIOUS

PDF

95.8 KB Created: 2021-03-30 06:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5b78582bc556d5f22726f7f83f36625a SHA-1: 08712db490f28047c356814f6e28ab0a1486abe8 SHA-256: aa4707cf302d441074c84597aed522adbb83d960e8efde06e145da910e1e6754
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or redirecting users to malicious sites. The document body, though partially corrupted, contains text related to a "parents guide" which is likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bologen.ru/123?utm_term=dinner+for+schmucks+parents+guide PDF link annotation
    • https://cdn.sqhk.co/zupuguvawaj/gehiIg6/74979502569.pdfIn PDF document text
    • http://oneplusonemain.xyz/extremely_juicy_never_have_i_ever_questions92kwm.pdfIn PDF document text
    • http://scrlt.xyz/dell_inspiron_6400_bluetooth_turn_onr7vnb.pdfIn PDF document text
    • https://cdn.sqhk.co/sikibeve/hc0jcha/84223114091.pdfIn PDF document text
    • https://cdn.sqhk.co/wovedajuraki/gjidbjb/27278801096.pdfIn PDF document text
    • https://cdn.sqhk.co/pagifizipafo/zQijhfQ/bahut_jyada_video.pdfIn PDF document text
    • https://cdn.sqhk.co/kabevapixox/fqKGfge/download_game_zombie_shooter_king_mod_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuwutitaw/jajgjeY/bifinovezukabigoves.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/yLuihgA/classic_arcade_games_online_donkey_kong.pdfIn PDF document text
    • http://whysmall.space/niziwijaravijiwagunbctf9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://156bb51f-0b62-477f-88ca-8620af00812b.filesusr.com/ugd/e3ff21_dfdfa3470a91448daa73490519c4ee4f.pdf?index=trueIn PDF document text
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_f521aca86be94afe862ba52abcbd2a08.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/92532fab-f5bf-4661-9790-0dfa84881ba1/18680593386.pdfIn PDF document text
    • https://f38be386-5799-403b-9303-fb121113655a.filesusr.com/ugd/6f1aa7_30443cb724164a208f4ae0de5589cc1d.pdf?index=trueIn PDF document text
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_814e1c646f184fa8adbfc791c3bc7639.pdf?index=trueIn PDF document text
    • https://d7e981a8-8c4a-445e-aef0-60d3d4911bd2.filesusr.com/ugd/65d69c_6a3db75634ad42bc8d71eb7bc4d32b1e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/91bb5f78-132e-459a-a954-ca2e283a00fa/line_6_pod_xt_live_manual_espaol.pdfIn PDF document text
    • https://9a86171b-24d8-4f43-8717-687e75280c8f.filesusr.com/ugd/6234e8_a75909763e4441b1a200b0a48ac37976.pdf?index=trueIn PDF document text
    • https://a79c6309-487e-499f-a993-0ac454a400c8.filesusr.com/ugd/747acf_eaabfd0806b64cb1b09a85d9276699d8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e66ffbd-eb88-4ee9-aee6-29cbd59caf9c/los_juegos_del_hambre_2_pelicula_completa_espaol.pdfIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_89a939828a4d43889834f423425ac4be.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d038d35a-5c36-4680-90bc-81f9e4d088a0/at_lp60x_manual.pdfIn PDF document text
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_d8f92140d9274bd7a0fa4c6d25e3b086.pdf?index=trueIn 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_off00013958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13958 5600 bytes
SHA-256: 049063375aae13cc30ba978031b9d220e73b00bdf77c8aeb154df31d94412379
font_01_sfnt_off00014c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C43 11216 bytes
SHA-256: 2ddaa0762ff68e50b772f76892aa9f1bb159de46ad66750caabf0e48ae3ea081

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