Malicious PDF — malware analysis report

Static analysis result for SHA-256 8858fdad45dda134…

MALICIOUS

PDF

85.8 KB Created: 2021-04-03 00:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a806cb8c37c188d4de133ce60228d61f SHA-1: 27cda9345c5a8ab5d8d09534a794bf360b12fdc1 SHA-256: 8858fdad45dda13466e43c2e669c1e84ade0f36a90ac74fa01fe8066d91a480e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to potentially malicious content, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://gimoguvi.ru/strik?utm_term=oracle+database+pl%252Fsql+packages+and+types+reference+11gr2+pdf PDF link annotation
    • https://cdn.sqhk.co/gukokefa/ja7jahh/western_union_mobile_wallet_usa.pdfIn PDF document text
    • http://zapitexidij.mypressonline.com/vidicon_camera_tube.pdfIn PDF document text
    • https://cdn.sqhk.co/rixutixim/hd8Uhg2/44412744027.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/JmDqibr/pearl_jewellery_manufacturers_in_hyderabad.pdfIn PDF document text
    • http://latitekiwa.scienceontheweb.net/26250446409.pdfIn PDF document text
    • https://cdn.sqhk.co/lugizumevemu/xQWhhhd/mystery_hidden_objects_games_play_free_online.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/salosibejodod/innovate_uk_funding_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/4005058458.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/how_do_i_move_apps_to_sd_card_on_galaxy_tab_a.pdfIn PDF document text
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_6e9509050d0441dbbc1a7896d182f364.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/xujebebuled.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/vamag.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/kemiven.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/27979931058.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/halo_bassinest_swivel_sleeper_bassinet_-_essentia_series_white_blue_ikat.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/yamaha_moto_4_350_engine_oil.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/79201410244.pdfIn PDF document text
    • https://96daf755-36ed-4ece-a185-bed8db3f70ea.filesusr.com/ugd/a95cda_01c57b669404462099ff30cf5f201818.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nojemi/who_makes_simplicity_snow_blowers.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/vepotelowexe.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/bcbsil_prime_therapeutics_prior_authorization_form.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/bugafid.pdfIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_d994f613c4b0498dac0a398b18b304ae.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_off00010f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3D 6004 bytes
SHA-256: 092ceda38ef8e7808ce8c5b1173b59a9d09c424202a39634279ac0e7b6c8c1dc
font_01_sfnt_off000123bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BC 10936 bytes
SHA-256: 6c0967d1a0120786976809032a6219320fff2eecec82b2ede07551a84954eb8c

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