Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a65e015872bf574…

MALICIOUS

PDF

77.0 KB Created: 2021-03-12 18:45:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: aa53fc7811e4f9725998776233c6f4c5 SHA-1: de5923c1cd1dec3fd3ae94c4d580ee2efdb09ebe SHA-256: 6a65e015872bf5747298b2a35211a11b9f8604acc160ec390ae11bc48cf88422
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, suggesting it was generated programmatically to serve as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://ponafet.ru/strik?utm_term=poulan+pro+leaf+blower+carburetor+adjustment PDF link annotation
    • https://cdn.sqhk.co/vofaruvukuk/e8jgsid/start_up_business_grants_covid_19.pdfIn PDF document text
    • http://gemubanabugawa.mypressonline.com/49699174875.pdfIn PDF document text
    • http://panedapupugaxe.22web.org/kidofazawolujatikiton.pdfIn PDF document text
    • http://mitimewigupito.mypressonline.com/asus_rt_n66u_forgot_admin_password.pdfIn PDF document text
    • https://xemupawiked.weebly.com/uploads/1/3/4/3/134321325/1052866.pdfIn PDF document text
    • http://faxagigotitij.66ghz.com/pia_vpn_for_mac.pdfIn PDF document text
    • http://dasuwupozu.22web.org/1907016034.pdfIn PDF document text
    • https://cdn.sqhk.co/wenegifuteg/lENgcjb/ww2_european_theater_vs_pacific_theater.pdfIn PDF document text
    • https://cdn.sqhk.co/rulopojuna/ghwgjHN/100_amazing_did_you_know_facts_trivia.pdfIn PDF document text
    • http://rusewigojubilon.mygamesonline.org/5793725786.pdfIn PDF document text
    • https://zekaxuwamawebi.weebly.com/uploads/1/3/5/9/135961115/9578418.pdfIn PDF document text
    • https://cdn.sqhk.co/purawewus/bjaDib1/laser_quest_canton_ohio_prices.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/gajavunolovamabenunif.pdfIn PDF document text
    • https://cdn.sqhk.co/vafegijateno/bYrjgjf/paypal_credit_free_phone_number.pdfIn PDF document text
    • https://boxuvudadutubip.weebly.com/uploads/1/3/2/6/132695546/xumiwunuza-bopumakolefikaz-rirababaw.pdfIn PDF document text
    • http://kokoponabile.iblogger.org/the_stranger_by_albert_camus_quotes.pdfIn PDF document text
    • https://boretenewur.weebly.com/uploads/1/3/1/4/131453221/peguvexijujopub-wafeji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/44411357-b320-4008-905b-67fb50437c9c/gifawibivep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d706fa1-8db4-4ddf-8ba1-fa82c0307292/26867441607.pdfIn PDF document text
    • http://wavudipikudela.epizy.com/monig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5f1e7e6-46e7-4df3-934e-6628ca1e4335/rebekilekofev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7036b120-2917-4758-b6c4-f9c29dfe8e2f/how_to_use_a_lathe_machine.pdfIn PDF document text
    • http://tuzuxutetug.atwebpages.com/dr_scholls_comfort_plus_footbath_with_bubbles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebde4c58-ef40-41e3-9391-8c6d7b05a97b/kawasaki_bayou_250_bigger_tires.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_off0000efee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEE 5612 bytes
SHA-256: 3a86b7a39c24f5d17138d2e2fe46a6c6aa9eb0c833565e0444c2a488ad3add36
font_01_sfnt_off00010302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10302 10312 bytes
SHA-256: d1c400b90d5c9c7582d94ad33d44569436854e0cf3d8ed5a2bfdafe30b3daff4