Malicious PDF — malware analysis report

Static analysis result for SHA-256 963dd884149b9bd7…

MALICIOUS

PDF

80.3 KB Created: 2021-02-26 16:53:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: cc2cdbdd78f79a7cb5920635a620252e SHA-1: c70d3469715137ca61d8af914fbbc54fe121f4e3 SHA-256: 963dd884149b9bd71fc9f4e2941cfa3a587c59d2b16af3ff66479c696ef67d04
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to be a lure related to 'noun phrases exercises with answers pdf'. The presence of numerous external URIs indicates an attempt to redirect the user to potentially malicious content or advertising sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://botokaw.ru/wb?keyword=noun%20phrases%20exercises%20with%20answers%20pdf PDF link annotation
    • http://pakirekugep.scienceontheweb.net/41666075595.pdfIn PDF document text
    • http://gexopidikimo.mygamesonline.org/the_anunnaki_chronicles_a_zecharia_sitchin_reader.pdfIn PDF document text
    • https://cdn.sqhk.co/movozuba/9hfFvOz/86862238774.pdfIn PDF document text
    • https://cdn.sqhk.co/dosakupu/Nt8KZig/stumble_upon_meaning_marathi.pdfIn PDF document text
    • https://baxelawinojiw.weebly.com/uploads/1/3/4/3/134333718/1793039.pdfIn PDF document text
    • https://vinofuloro.weebly.com/uploads/1/3/4/8/134850824/706ef5e1.pdfIn PDF document text
    • https://jetovalanowu.weebly.com/uploads/1/3/0/7/130739462/nuzunipoti.pdfIn PDF document text
    • https://gofolepoxi.weebly.com/uploads/1/3/4/8/134882907/nosiwupi_tutel_fonatut.pdfIn PDF document text
    • https://kogemopisita.weebly.com/uploads/1/3/0/7/130776015/89f17bb61.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/wichc3W/papopafa.pdfIn PDF document text
    • https://cdn.sqhk.co/wevubuse/aqqCpge/giwezovog.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/how_to_use_hamilton_beach_digital_steamer.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/2600_calorie_meal_plan_weight_loss.pdfIn PDF document text
    • https://cdn.sqhk.co/rirexiwudag/chjmqhe/wujomijexifel.pdfIn PDF document text
    • https://cdn.sqhk.co/senosekagoko/fihXOO8/jozir.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/gjgggfI/40142830094.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zutugidod.onlinewebshop.net/john_deere_zero_turn_lawn_mower_with_bagger.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/mejaniduwuvupopanugiwu.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/56850367818.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/gastroenterology_clinics_of_north_america_free.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87E 5340 bytes
SHA-256: ef04b2c74d7148bd847d3f6d41162db2948b3f776c9f43d9fc694d938553a842
font_01_sfnt_off0000fabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABB 10476 bytes
SHA-256: 472308b6a0823700bb25af1782f8ac9439dad037b91c6d39e3c512258acdfb51
font_02_sfnt_off00011e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E87 16096 bytes
SHA-256: 7e28333d71a2e4573b221cfd9371d800bf7c4d3f8dd8c76d056b2d1db0f3cb40