Malicious PDF — malware analysis report

Static analysis result for SHA-256 4985b40047bdbc8f…

MALICIOUS

PDF

69.2 KB Created: 2021-01-26 01:36:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 305dc39ca3f834455d9aafb574b85f38 SHA-1: 90a95d19258702a476b8d631ecc841cd71e7f7a9 SHA-256: 4985b40047bdbc8f1f143847bdee33410f958756c4371be3ba90f6e9f2e74f0b
156 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to contain metadata related to its creation, but no direct instructions or lures are discernible. No scripts were extracted, but the presence of numerous external URLs points towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/123?utm_term=reflections+5th+grade+social+studies+book+online PDF link annotation
    • https://cdn.sqhk.co/gesokusa/eijgcjg/ordain_synonyms_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/gopefovepagi/Jifa2qk/jubekugabixesi.pdfIn PDF document text
    • https://cdn.sqhk.co/xutazazo/JgfiaUV/find_the_ball_under_the_cup_game.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/bjhghig/tuner_life_online_drag_racing.pdfIn PDF document text
    • https://cdn.sqhk.co/gunonutib/eigSiiz/lista_juegos_retrocompatibles_ps5.pdfIn PDF document text
    • https://cdn.sqhk.co/melalisopapu/9jajhxU/subway_train_runner_2016.pdfIn PDF document text
    • https://cdn.sqhk.co/pisapaxosabo/8aqCifu/phoenix_airport_car_rental_hertz.pdfIn PDF document text
    • https://cdn.sqhk.co/towinomer/cjdIIgg/94532417893.pdfIn PDF document text
    • https://mimevomakiket.weebly.com/uploads/1/3/4/6/134693464/rinujukisesuwitoxi.pdfIn PDF document text
    • https://cdn.sqhk.co/fasotaluvose/jj5hjhi/flights_from_london_city_airport_to_dublin_today.pdfIn PDF document text
    • https://cdn.sqhk.co/tokititagiwe/zFgehuK/mr_cannon_ball_blast_shooter_games_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/gidufulelav/Vl3hcnR/kosevatuviwozamegij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wojobawezelo.rf.gd/losule.pdfIn PDF document text
    • http://jazupizewatabal.epizy.com/statistical_learning_with_r.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/black_and_blue_theme_song.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/jojugomemam.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_off0000d159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD159 5620 bytes
SHA-256: 88ea8ca96c9d582b5dd01c0a6bcd561b4013ccbaa45e7b98cbc01a4f65998d2a
font_01_sfnt_off0000e477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE477 10420 bytes
SHA-256: 94e0c1509a678abf56d53972c33cb875b5537fec60420931cf2c635d335f0ce5

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