Malicious PDF — malware analysis report

Static analysis result for SHA-256 2560b8e3fc9e973b…

MALICIOUS

PDF

73.4 KB Created: 2021-03-22 11:11:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35051639648abfd4020ffae779a8375b SHA-1: 94c80294b0c8ca0fe9a76a878654607cffc086eb SHA-256: 2560b8e3fc9e973b2a4b76adbf0663fca68981ce357a925f4cffbcebccf40aaa
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically indicating a phishing or trojan-like behavior. It contains a large number of external links, suggesting it functions as a link farm designed to redirect users to potentially harmful websites. The presence of embedded URLs and the ML classifier's high confidence score further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/wix?keyword=the+cell+cycle+pogil+answer+sheet
    • http://jobware.pro/795705655398tfjn.pdf
    • https://betofatosipetu.weebly.com/uploads/1/3/4/7/134771425/2208425.pdf
    • http://help-lnstagram-verifycopyrgiht.com/82354590464jgmk2.pdf
    • http://cleaner-inn.club/2007_tahoe_boat_owners_manualqtbks.pdf
    • https://nulesurusisozi.weebly.com/uploads/1/3/4/7/134744420/7733006.pdf
    • https://revawovaweku.weebly.com/uploads/1/3/4/0/134013066/pufitawalixi-febaf-womifagog-falijiwekubid.pdf
    • https://baliwiwun.weebly.com/uploads/1/3/1/3/131380001/6695211.pdf
    • http://shoppingyxplus.xyz/undiscovered_worlds_with_steve_backshall_episode_guides8yst.pdf
    • https://rujuzodojavumip.weebly.com/uploads/1/3/4/7/134726220/noziwupiva-bitanunanezerin.pdf
    • http://vorecan.space/automatic_document_feeder_not_workingr3kdn.pdf
    • http://artrosil.xyz/kofigitodimoxetoip3l.pdf
    • http://taher-tcac.com/do_sodastream_flavors_expirel0a4b.pdf
    • http://kdghy.online/beginner_novice_expert_levelsmq7ul.pdf
    • https://wimiwimevodozaz.weebly.com/uploads/1/3/0/8/130874111/a56740e7be3ade.pdf
    • https://dirifulezidume.weebly.com/uploads/1/3/2/7/132740871/raviwo_sapuferupino_bifib.pdf
    • https://gofolonuk.weebly.com/uploads/1/3/4/3/134313710/zawixum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/bc6089a0-5ada-41ce-994b-ff97b9c04193/lasko_box_fan_replacement_parts.pdf
    • https://uploads.strikinglycdn.com/files/7a3e54dc-f81c-4ec1-9700-fec2f7f66665/perixefejutozejefudumam.pdf
    • https://s3.amazonaws.com/ronenitevodo/mowozagolike.pdf
    • https://s3.amazonaws.com/dobikasukavu/popusede.pdf
    • https://s3.amazonaws.com/bisute/real_city_car_driver_game_apk.pdf
    • https://s3.amazonaws.com/wamatasamegu/aac_format_player.pdf
    • https://s3.amazonaws.com/pugomonapoxuxe/43329955968.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d654.bin
cd01b16d855cd098b40f81c6c7cb5e0b2e02894e434d3064ef0f74aab45e3ed1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD654 5128 bytes
font_01_sfnt_off0000e7c8.bin
2ac4632fedf0fb2fa3c1f4611e68b9a2d991162e758c250d09a3ca66575b39ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C8 10012 bytes
font_02_sfnt_off000109db.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x109DB 4324 bytes