Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec7e9c9e66943b88…

MALICIOUS

PDF

78.9 KB Created: 2021-03-25 12:19:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e3acbe1832771e313aa64b4c6b70c266 SHA-1: 86995c46053cf477f88fe99fe81bbd7204f8f006 SHA-256: ec7e9c9e66943b88597ac1d5480b1a23d9cf4175da029afeefd6be8566270d60
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains embedded URIs pointing to various domains, including one that appears to be a keyword-based redirector. The document body, though heavily obfuscated, suggests a lure related to an 'iit physics 221 lab manual', which is likely a pretext to drive traffic to the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/wix?keyword=iit+physics+221+lab+manual PDF link annotation
    • http://xexobifu.22web.org/bipoxebotebemipezul.pdfIn PDF document text
    • https://cdn.sqhk.co/lusimalifa/dje7ib8/be_my_little_baby_bumblebee_chords.pdfIn PDF document text
    • https://cdn.sqhk.co/totimujid/hiceWhd/shipping_and_receiving_assistant_manager_job_description.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/fifhawW/deccan_merchant_bank_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/jdJjcij/meregerixefeser.pdfIn PDF document text
    • https://cdn.sqhk.co/fosuzonarefi/g8hb4el/79157612398.pdfIn PDF document text
    • https://cdn.sqhk.co/fetumamuv/icjdgeO/lopomada.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/2fjdugc/candomble_religion.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482631/normal_5fed58ef79bb1.pdfIn PDF document text
    • https://cdn.sqhk.co/wosipuvetot/JrrghRY/tlcharger_aptoide_gratuit_sur_android.pdfIn PDF document text
    • http://canonsburglake.com/lloyds_pharmacy_digital_thermometerwrpx3.pdfIn PDF document text
    • http://respect-ltd.su/413541279081hv3p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403127/normal_600485bd8edc8.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
    • http://zarixisulepu.rf.gd/dexuv.pdfIn PDF document text
    • http://bovumemudij.rf.gd/zapofifu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4d97620-e2f5-4c99-b6d0-0c4d3c333469/the_sorrow_of_war_chapter_summary.pdfIn PDF document text
    • http://bavubuseji.epizy.com/body_mind_spirit_guide_magazine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7ea0f1c-ac2f-4c40-beb6-38b067f14ae3/mobizen.pdfIn PDF document text
    • http://fawogalupa.epizy.com/81866715364.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D0 5096 bytes
SHA-256: 372713c1fc66c2babb553f0ae23f87345fccbf6dbbb8d4968521fe99590afe4f
font_01_sfnt_off0000e3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FC 11292 bytes
SHA-256: 61a27e5bf676c8478955b2425545374548989c591cbe4bc80de0634d7ad5b2b4
font_02_sfnt_off00010adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADC 16168 bytes
SHA-256: abfa9c732f0853890ff50ff42d6b287fe1e0c6af20579eabb8603c13058e112b
font_03_sfnt_off00011ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF9 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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