Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc9761611a97414d…

MALICIOUS

PDF

76.6 KB Created: 2021-04-23 13:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: af2ce70f2637173209febffb97b49a52 SHA-1: 274eb3cd3d91d4f253102cf0dfea47bd7df6aced SHA-256: dc9761611a97414d1077dd1875e214d5514fcd584753e77fc0703afa559ef174
206 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, suggesting a link farm or SEO abuse tactic. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. While no scripts were explicitly extracted, the PDF structure and numerous external links, including one that appears to be a redirector, suggest it may be used to host or redirect to malicious content, potentially involving JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://druttle.ru/strik?utm_term=dyson+cinetic+big+ball+animal+2+bagless+cylinder+vacuum+cleaner PDF link annotation
    • http://rigojakivuvemi.iblogger.org/13794668401.pdfIn PDF document text
    • http://mafonofolifeda.22web.org/visan.pdfIn PDF document text
    • https://cdn.sqhk.co/susotizakaxe/5idgc7Q/27795848233.pdfIn PDF document text
    • https://cdn.sqhk.co/mofokamibe/cjbcjgP/onward_read_along_storybook_and_cd.pdfIn PDF document text
    • https://cdn.sqhk.co/zoribakim/lieARjf/gerijofiros.pdfIn PDF document text
    • https://cdn.sqhk.co/matijamaj/hicAImu/want_to_delete_my_wikipedia_account.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/hjjdqq5/carpet_3d_model_3dsky.pdfIn PDF document text
    • https://cdn.sqhk.co/perokokamosa/ageO3jc/xikunejezif.pdfIn PDF document text
    • https://cdn.sqhk.co/nezusoxe/gfFwheK/chicken_poop_and_compost.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/miwolezedubujoz/rumixavagulakima.pdfIn PDF document text
    • https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_39e7576d37c849588a44114c09bdc7f9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vosimalume/scavenger_hunt_template_google_docs.pdfIn PDF document text
    • http://gumuleg.epizy.com/25717950892.pdfIn PDF document text
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_23e63da3d7014f27865f5428a471edf2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/ketolik.pdfIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_2c7625d31f9b40448289e850372c77de.pdf?index=trueIn PDF document text
    • http://genuxemesusirif.rf.gd/xokano.pdfIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_ebda8f6c251449279a384238e42c0423.pdf?index=trueIn PDF document text
    • https://f171294f-ed7a-4884-a773-1e826a512430.filesusr.com/ugd/20d861_28be4d2049d74c7d84ea761a8cacd64c.pdf?index=trueIn PDF document text
    • https://ced6af22-cf5f-4df0-9cd6-2d424634d287.filesusr.com/ugd/3eed2b_5f5916aec10049a8a77f60682391d3e3.pdf?index=trueIn PDF document text
    • http://likijanima.epizy.com/12654856220.pdfIn PDF document text
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_99429d51ff7a4a0da906f4342241b69c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rizoli/53341919200.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/daft_punk_get_lucky_bass_sheet_music.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_off0000e93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93F 5692 bytes
SHA-256: d26bbe3e6b0e15fcdf9ac0349d3dcc5309419a52cdb3f74277ad03fdd2c5e19e
font_01_sfnt_off0000fc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9C 11712 bytes
SHA-256: 556eb4db742603939ee174567dbce0c955b2049cd6f6ae44371c16c5c8e0f8ce

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