Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c35080a0698056d…

MALICIOUS

PDF

81.4 KB Created: 2021-05-04 06:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 271cde97f51d76d9463727b81a81bff9 SHA-1: cfb089155ee8fb7b3198efb23b81f686ca95fa70 SHA-256: 7c35080a0698056dfa9e0bafabfcf5f688389fa41f3c9fb4508a82363efdaa11
166 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as suspicious, including the presence of invisible links to potentially malicious domains and a high ML classification score. The ClamAV detection further confirms its malicious nature, identifying it as a phishing trojan. The embedded URLs suggest an attempt to redirect the user to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://pelibifir.ru/strik?utm_term=fifty+shades+of+grey+3+rotten+tomatoes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4497395/normal_5feaf05d53bb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471996/normal_5fdbca7d341b7.pdfIn PDF document text
    • http://cyberlife.store/80307784511myfw3.pdfIn PDF document text
    • http://reredikulole.22web.org/82013959734.pdfIn PDF document text
    • http://mikrotikwizard.com/circular_flow_chart_powerpoint_templatew42hf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458634/normal_5fddb060cd951.pdfIn PDF document text
    • http://naturagrush.space/popexupanetupugasagyvcdo.pdfIn PDF document text
    • http://re-capital.ru/how_to_find_cash_flow_from_income_statementgw14b.pdfIn PDF document text
    • http://securitycheckingbrowservkcom.xyz/914274528399c5wh.pdfIn PDF document text
    • http://stroy-level.ru/425586645672pqi5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375515/normal_60552fa60d823.pdfIn PDF document text
    • http://romeoplanet.club/figuvukigavasopuvone60c43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366354/normal_6005075e07b2b.pdfIn PDF document text
    • http://xajoxirutojik.iblogger.org/16761593250.pdfIn PDF document text
    • https://cdn.sqhk.co/dovawowo/eUkmbZj/luke_bryan_songs_youtube_playlist.pdfIn PDF document text
    • https://cdn.sqhk.co/vitikitema/bT2Pjdj/merge_dragons_wonder_fruit_tree.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/24d135e5-3843-4f16-88b6-07cc6c050999/how_to_put_samsung_refrigerator_into_diagnostics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/117c7940-62ab-4ef4-a382-469f737800f1/94920951636.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e2fc751-068d-45ec-97a1-4d3543c16229/hypertherm_powermax_30_or_45.pdfIn PDF document text
    • http://jaziwovapotulit.epizy.com/20015206424.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aaf13e4-30e9-4df1-882c-bdbe2cb1bf3d/2767861253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc528d4b-e07f-49e1-9b7f-66b8cebe0a87/big_fish_games_forgotten_walkthrough.pdfIn PDF document text
    • http://nejotuwusa.rf.gd/76162523647.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_off0001011b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011B 5512 bytes
SHA-256: ccf6b092c8efe60f994d4766eb226a41deb1bf41493082abef8388f1939cdaf8
font_01_sfnt_off000113c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C3 10580 bytes
SHA-256: 6073199dc68a448af93c85629b49ab594add7560e1c50466c45cfe06ae067af6