Malicious PDF — malware analysis report

Static analysis result for SHA-256 82e01f16b223da78…

MALICIOUS

PDF

78.6 KB Created: 2021-04-01 10:40:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ab58242f2e63715f52dcab5bcb21a47f SHA-1: 746843f6884f77987f0bd18bcf2f49783a0fdd33 SHA-256: 82e01f16b223da78d5971b83d2e3382df8c911af0f1df45b14bdd2eb27f1c5fe
206 Risk Score

Malware Insights

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

The PDF contains malformed streams and a high number of external links, indicating it is likely part of a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, possibly for phishing or distributing further malware. The embedded URLs point to suspicious domains, and the document body, though truncated and malformed, suggests a lure related to 'poverty in third world countries'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://jumiwimov.ru/award?keyword=poverty+in+third+world+countries+pdf PDF link annotation
    • https://cdn.sqhk.co/getabemuto/bmhegdW/81594801286.pdfIn PDF document text
    • http://rixanemusijod.mywebcommunity.org/atlas_copco_air_compressor_ga90_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/pogezasamu/TwTgejb/67247347233.pdfIn PDF document text
    • http://nitafibejuze.mygamesonline.org/what_color_magic_deck_should_i_make.pdfIn PDF document text
    • https://cdn.sqhk.co/gubogezemazo/ic1hfBi/tarogomomodoji.pdfIn PDF document text
    • https://cdn.sqhk.co/mibemofega/aYMjbid/73931442211.pdfIn PDF document text
    • https://cdn.sqhk.co/vojofarakiva/2Amiihd/my_t_mobile_login_bill_pay_one_time.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/5775c126-55ca-415d-9a60-feefc8c2bcd1/32392611558.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/899f3880-573b-4347-9c7b-3ca44534a86a/how_to_do_apa_references_in_google_docs.pdfIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_ec4bd2be863043159d08e4ca9528c859.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0199d032-f32d-4ee9-86a2-f3f0e1f14265/how_to_say_curriculum_vitae_in_english.pdfIn PDF document text
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_75c001ca4679401d921b382e60a79fd5.pdf?index=trueIn PDF document text
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_75926f5ed87a4bd5af463501656e5f07.pdf?index=trueIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_def785066b3d429aabfccdf8b8e610fe.pdf?index=trueIn PDF document text
    • https://0dc5fd1c-b354-4e5b-9ccd-45395e8994ed.filesusr.com/ugd/f79e8d_a559afed41d04eaa961011fa3655e298.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c16414a3-1c91-475a-bc7e-50b8dba3e320/honeywell_k4392v2-h_change_battery.pdfIn PDF document text
    • https://e082cb0d-9c22-4a21-acb7-e2c6127a51d3.filesusr.com/ugd/ff0c06_4224324a0c274a10852026b41d279ebb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fedeae72-466a-4986-ba4e-6feef3e961de/cyberpower_cp1500avrlcd_intelligent_lcd_ups_system_manual.pdfIn PDF document text
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_f0bbef90d6324eb38c2cd55fc73eef16.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/47bad8a2-3112-46d4-91f4-b3f8e01caf69/how_to_draw_in_architecture.pdfIn PDF document text
    • http://toxifiv.myartsonline.com/kodakixuvomib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd8dcbeb-a64b-498a-a9a3-0c0b4baf3278/behringer_xenyx_x2222usb_mixer_case.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/863d9af5-2143-4e06-b4c5-2f4148fd9955/dawawexisa.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_off0000f6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C7 5288 bytes
SHA-256: 9885bba5bcde39d132d7047eca50fe15193b8d9cb49b3af1d619fdf4811ff4ab
font_01_sfnt_off000108e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E1 10468 bytes
SHA-256: 18db630ad04b39b5bfcb8cf7b2d81e429dfacdce3c3ffa3cdb015f0aefe303bb