Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a56903cf8741389…

MALICIOUS

PDF

73.3 KB Created: 2021-04-04 00:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 681c91e8dd115b5fea5d4f2a6aee88de SHA-1: 58f2feb220121ce712e2b6cbc1c35e16f3db9b43 SHA-256: 2a56903cf8741389f9c790b038430a1efd096b1c89a5117d1f58afa77abc59a4
186 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. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crophysi.ru/wix?keyword=diamond+dave+ninja+nunchucks PDF link annotation
    • http://fsbsiod.com/the_norton_anthology_of_african_american_literature_third_edition_vol._volume_2nr3wc.pdfIn PDF document text
    • https://debozolajaxagaf.weebly.com/uploads/1/3/1/0/131070846/2483616.pdfIn PDF document text
    • http://nasty666.space/altivar_21k8p2w.pdfIn PDF document text
    • https://silujufadusume.weebly.com/uploads/1/3/1/1/131164496/831bf5636cf2c.pdfIn PDF document text
    • https://nafusulujaj.weebly.com/uploads/1/3/4/5/134596397/14e7e7ac7b0c536.pdfIn PDF document text
    • http://new-volosi.ru/wd_my_passport_wireless_ssd_vs_projebap.pdfIn PDF document text
    • http://espaceabonnes.com/42648282606fmv3b.pdfIn PDF document text
    • http://dhl-order.info/66304767739h89cr.pdfIn PDF document text
    • http://obsluzhivanie-kompyuterov.moscow/doxidugizelawilakazwg5ui.pdfIn PDF document text
    • http://idealica-it.website/kexevoko0bmlz.pdfIn PDF document text
    • http://all-host.site/kenmore_80_series_washer_wont_spin_no_soundf44bb.pdfIn PDF document text
    • http://newyearshop.site/how_to_make_flamethrower_exhaust_at_homeul0fv.pdfIn PDF document text
    • https://nitogufufuwal.weebly.com/uploads/1/3/3/9/133997090/8d8d2e4f4ed57.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e26dc784-fa46-4601-9f6d-57686faaf216.filesusr.com/ugd/c66525_c096cb23871147f7b991992c4ccf2ab5.pdf?index=trueIn PDF document text
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_495a0a51ac4b4d648627c9eb667de94c.pdf?index=trueIn PDF document text
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_5052f17afc7e422695c8331bd485ebf5.pdf?index=trueIn PDF document text
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_4f8448c348ee4b5fbb6ec9e26c450f3f.pdf?index=trueIn PDF document text
    • https://0efdb04f-128a-4c0d-ace4-8b312723ebcc.filesusr.com/ugd/5508f4_f497313a27024d039910bc8fafe2b553.pdf?index=trueIn PDF document text
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_899400fe027e480598d72b7a7142051e.pdf?index=trueIn PDF document text
    • https://591e60e9-54e8-4b06-a9a7-f2e0522969d0.filesusr.com/ugd/1fd4b7_665680ce82c54ccfac9eff8297ad3abb.pdf?index=trueIn PDF document text
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_e7ebf6b2897f4d8c8bf93dcc741b2975.pdf?index=trueIn PDF document text
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_7c1a6af56efe487094d4387f1221a33e.pdf?index=trueIn PDF document text
    • https://dd39d194-9042-494f-90ab-223c96cf8da5.filesusr.com/ugd/5d3909_39599a7fd36a499fac2c389c52c7a0bb.pdf?index=trueIn PDF document text
    • https://9ef77391-fdd1-48d8-ba15-364b07375333.filesusr.com/ugd/ebefdf_62e445f14b1f45beb8165cbed7d45577.pdf?index=trueIn PDF document text
    • https://6731adf0-0bfb-4e29-9024-dbf0b6c78d19.filesusr.com/ugd/163ed7_2572f7c1eccd4ac19ce1164489ad1660.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_off0000df1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1B 5248 bytes
SHA-256: 393ad45c96644f99e7733ff3d350848170dc9996cdd4da7cd5f5b709924b540d
font_01_sfnt_off0000f0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E3 10908 bytes
SHA-256: 1334e90190c9d7e261256b7b95d1affee974674bfe2060c5e92e56dad7d6fe57