Malicious PDF — malware analysis report

Static analysis result for SHA-256 a278093778c60a80…

MALICIOUS

PDF

82.0 KB Created: 2021-02-27 16:45:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e9eb28a2da040b016d994161702145cc SHA-1: 996f85950b7debc84070bdcd8ab0964a96a4bff4 SHA-256: a278093778c60a803362f282778c0f01799c209c7beda4895e3188d1f4524442
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier strongly indicate this is a phishing or malicious document. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/123?utm_term=starbucks+coconut+milk+latte+nutrition PDF link annotation
    • https://cdn.sqhk.co/limizolaxa/e4hcheK/last_hero_zombie_state_survival_game.pdfIn PDF document text
    • https://cdn.sqhk.co/divojimo/gchcigz/daily_deals_amazon_canada_2019.pdfIn PDF document text
    • http://edarudost.online/baptist_distinctives_book9femv.pdfIn PDF document text
    • https://pexigupor.weebly.com/uploads/1/3/4/9/134901766/14d079c657744.pdfIn PDF document text
    • https://cdn.sqhk.co/gufojakig/jdWEihQ/nepewine.pdfIn PDF document text
    • https://cdn.sqhk.co/lewulula/xJGgdOk/skylanders_giants_3ds_starter_pack.pdfIn PDF document text
    • https://cdn.sqhk.co/lorotukogof/jdhdJgh/fuwesarumikofibiboku.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/mhd7qOp/can_you_escape_the_room_x_level_37.pdfIn PDF document text
    • https://bevarepovorumi.weebly.com/uploads/1/3/2/3/132303359/janowutu.pdfIn PDF document text
    • https://gatepeduvemixif.weebly.com/uploads/1/3/4/6/134669895/fejesodogokek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zafibimutadoti/jekepuzugodi.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/31984533502.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/how_to_make_an_adventure_game_in_unity.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/widosoviwigi.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/audiophile_optimizer.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/61520600311.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/questions_to_ask_interviewer_teacher_job.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD9 5132 bytes
SHA-256: 999717be4e70a814d4a46526222e9edb3bbc00412d24a242eac81749029fc11e
font_01_sfnt_off0000fe24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE24 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off000106b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B2 10828 bytes
SHA-256: 7e1d6b42544224f392eae960080b08296b323341b353bf34c5ec50539065d974
font_03_sfnt_off00012bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB9 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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