Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a87f0bbc11ac66…

MALICIOUS

PDF

81.6 KB Created: 2021-03-27 13:51:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: affaf10a0f6d5074f495ca858c5372a1 SHA-1: e8a221150eb1eed3a90b4d809a033cf7b19ed042 SHA-256: c4a87f0bbc11ac6634bc37a0cf8409685631654ff5eb154ea9685ea56b0dc223
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://golowaki.ru/strik?utm_term=python+tutorial+for+beginners+in+hindi+by+saurabh+shukla PDF link annotation
    • https://timonuwek.weebly.com/uploads/1/3/4/3/134383578/479482f9c4.pdfIn PDF document text
    • https://gemamiji.weebly.com/uploads/1/3/4/3/134372226/992624.pdfIn PDF document text
    • https://cdn.sqhk.co/rufopunuk/X9Yhcgc/88079252558.pdfIn PDF document text
    • https://cdn.sqhk.co/joxopejufito/amPDkq5/wuponotumunafikatiguk.pdfIn PDF document text
    • https://cdn.sqhk.co/zugeketinog/W56Dhfz/16018208294.pdfIn PDF document text
    • http://kompledom.com/rival_crock_pot_scvc600_manualrd5et.pdfIn PDF document text
    • http://sberhome.ru/jilolaluzew4pdov.pdfIn PDF document text
    • http://edaeda.moscow/how_to_turn_off_seatbelt_alarm_ford_ranger_2012qji43.pdfIn PDF document text
    • https://cdn.sqhk.co/terasovo/jiYejj2/free_classic_rock_ringtones_download.pdfIn PDF document text
    • https://tutemedoz.weebly.com/uploads/1/3/2/8/132814241/lirujawatorag.pdfIn PDF document text
    • http://koteyarn.moscow/is_br-_lewis_acid_or_basepb2kx.pdfIn PDF document text
    • https://cdn.sqhk.co/mugapowejog/igge45v/19865134460.pdfIn PDF document text
    • https://cdn.sqhk.co/kupibetefuko/jiiybjj/live_five_weather.pdfIn PDF document text
    • https://cdn.sqhk.co/ferobisuw/ighDZ3h/ninja_dashing_apk.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/c0300807-9a83-4718-a589-65f0edf017a3/fedex_drop_box_near_me_with_saturday_pickup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6c78911-98ee-49c9-ab54-f182f7942951/86288869612.pdfIn PDF document text
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_3c371d5d6f49409fbdab858c51851216.pdf?index=trueIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_cffbcbb98ac64e32ad6f96472da5a02c.pdf?index=trueIn PDF document text
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_74d0c011153945c9b1476c00dcb6f43c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/78d2049e-6f14-4764-ba82-4d5faf851857/char_broil_grill_cover_warranty.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d924cd42-fdd3-46c9-ac27-58fe887cca0f/what_is_the_difference_between_a_beretta_m9_and_92fs.pdfIn PDF document text
    • https://932aa67c-856a-4fda-9fc8-fe3f50d4acc2.filesusr.com/ugd/a25eee_7b491eb2870946d685b2323ad6e51746.pdf?index=trueIn 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_off0000e924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE924 5476 bytes
SHA-256: ca70deba07fb736abf0c44d3b1cc8ba59daec1a99ea243d66db08f88b587eb95
font_01_sfnt_off0000fbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC5 11640 bytes
SHA-256: 9dbc5011c8d61088c2e342924d3ad14c7bbf7573359e68d49adc23dedec6a96d
font_02_sfnt_off00012299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12299 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e