Malicious PDF — malware analysis report

Static analysis result for SHA-256 2528d9b6f23f0685…

MALICIOUS

PDF

96.5 KB Created: 2021-04-04 18:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b7c75bfcd2c48024acb79ed764e98665 SHA-1: 99ce6218e9654436efb5b4ee00b5f185ade65bb3 SHA-256: 2528d9b6f23f06858f868cfc0f076500f2da570d557806bc58b70c81c7efc96f
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' suggesting a tactic to drive traffic to potentially malicious or phishing sites. The embedded URLs and the nature of the heuristics point towards a phishing or content-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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://seumenha.ru/award?keyword=types+of+asset+classes+pdf PDF link annotation
    • https://cdn.sqhk.co/pumafuki/Vnjdjg0/jane_s_addiction_coming_down_the_mountain_meaning.pdfIn PDF document text
    • https://siragakepog.weebly.com/uploads/1/3/4/8/134890789/3558844.pdfIn PDF document text
    • https://batezumepew.weebly.com/uploads/1/3/4/4/134479003/milufajogawop-sosiju-busaz-resojedidom.pdfIn PDF document text
    • https://kukiramofup.weebly.com/uploads/1/3/1/4/131413837/merirejo.pdfIn PDF document text
    • https://cdn.sqhk.co/wefekoferu/T9Lahez/xaleremulepajat.pdfIn PDF document text
    • https://cdn.sqhk.co/pevelefotuve/ekiaggi/mars_lander_rescue_squad.pdfIn PDF document text
    • https://sujixiku.weebly.com/uploads/1/3/0/7/130739139/fed268c54.pdfIn PDF document text
    • https://cdn.sqhk.co/gisepavuv/gAWf6Kc/jogakuraxonideluwire.pdfIn PDF document text
    • https://nonibebufixaz.weebly.com/uploads/1/3/2/6/132682934/5045163.pdfIn PDF document text
    • https://silodadut.weebly.com/uploads/1/3/2/7/132712229/redojoten.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojiranat/hhPRI1k/share_chat_status_video_malayalam_songs.pdfIn PDF document text
    • https://raxorevowipafe.weebly.com/uploads/1/3/4/7/134765671/76680a5e04bf.pdfIn PDF document text
    • https://dopapebo.weebly.com/uploads/1/3/4/8/134870178/tevunedujowo_mefaxa.pdfIn PDF document text
    • https://vebafuxitupum.weebly.com/uploads/1/3/4/8/134890404/953123.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_a4dda1235d7d47658e12a48fdbc1cd9b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/92216940987.pdfIn PDF document text
    • https://s3.amazonaws.com/nasitevu/the_secret_garden_chapter_1_and_2_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/el_seor_de_los_anillos_libro_ilustrado.pdfIn PDF document text
    • https://b73b9701-b1df-43be-b031-73419f87697c.filesusr.com/ugd/bfbd96_90d932514a634ee1be28166fec3e7fee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1768738-8ba9-4198-8077-fc1734e0dda8/which_river_turned_to_blood.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/all_microtype_mystery_puzzle_answers.pdfIn PDF document text
    • https://22520ec4-2132-45a5-98b8-54db1b71d3ea.filesusr.com/ugd/b33b96_7f485f1208c34eb4ba96ebabd31639e7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/53062272354.pdfIn PDF document text
    • https://8fa10226-37c2-454d-bd65-ced70ecbf0c4.filesusr.com/ugd/c34aa9_25375d220fe34c42887f1207a73e9a09.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fcf85e2-1690-4027-a876-1745104e836d/dell_optiplex_790_audio_drivers_windows_10.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_off000138a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A5 5104 bytes
SHA-256: 30f3ec24fd01c70fcc1dbc89143b65ba1042600499a8519f39ef11733e90a44e
font_01_sfnt_off00014a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A25 12364 bytes
SHA-256: 234ae65c3ee53fc3fcc2b239e7bf8d294342e4bbc3f6265458f0f4a522149b75