Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b44ce53077c6f52…

MALICIOUS

PDF

93.5 KB Created: 2021-03-16 18:29:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c0bc5563febd36bb43eb2823b5c5ed61 SHA-1: aa1f359d3c6c2849c42fb1cab1321eeacf2ba1a5 SHA-256: 1b44ce53077c6f521bc6e55ee5c4c20e3ca19766f9d5a1bef2333083e62a08ae
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 0.9993

Heuristics 6

  • 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.
  • 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://xezojetit.ru/wix?keyword=world+history+2+sol+review+packet+%25233+answers PDF link annotation
    • http://pimidemo.iblogger.org/android_watch_faces_mickey_mouse.pdfIn PDF document text
    • http://sorulaxawo.iblogger.org/sky_sports_tv_guide_rugby.pdfIn PDF document text
    • http://honbiz.pro/britax_boulevard_expiration_date_location4g200.pdfIn PDF document text
    • http://damvglaz2.xyz/how_to_review_better3ky1r.pdfIn PDF document text
    • http://soguged.22web.org/63576824237.pdfIn PDF document text
    • http://pressit.space/37289592820d9pk4.pdfIn PDF document text
    • http://autocredit.moscow/nuziti11834.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://voxotili.epizy.com/amsco_apush_chapter_12_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b646cb65-7ce8-4838-9ae2-ca477b955cd2/sepufope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aec4686-bbf7-44c3-899e-5d862f8ffd11/what_does_the_color_black_and_white_mean_in_a_dream.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cf803fb-b729-4def-a0fb-30a79b2467e1/merixumijilukav.pdfIn PDF document text
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_05ad05674dbe4830be71d57697c736de.pdf?index=trueIn PDF document text
    • https://7605d98d-8b17-4a41-9383-f5c8d5af9bcc.filesusr.com/ugd/2bed4c_783e7f3ad88f4e56800f856ca2c2b3bf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9d3f6ca-5cda-4bd9-8f70-f65fad8414df/panasonic_kx-dt333_rufumleitung.pdfIn PDF document text
    • https://3b87a2b8-2d13-4e6d-acc4-cbba57692a59.filesusr.com/ugd/50988c_0e572bf0752f406281623bcc8e18b0fc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/74f3c52d-1cda-4037-9dda-cdb6884fe9fb/47377911991.pdfIn PDF document text
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_e158913a0eda417b9669564cc386f90b.pdf?index=trueIn PDF document text
    • https://5cd500b4-e4f3-461b-9830-2c08da4ac6df.filesusr.com/ugd/2d797c_9624de5f5cab4cc6ace14ff69e536caa.pdf?index=trueIn PDF document text
    • http://xodibux.rf.gd/sagirukoluwokak.pdfIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_8a974e314dac43ac9bc15cc682cdc7cb.pdf?index=trueIn PDF document text
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_a36806fc157c46ddbc01899e2333c008.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADC 5308 bytes
SHA-256: 9a75930cf6f8224b3448ea11d8f41e11cbfb8152274b38a80126be036f6f8351
font_01_sfnt_off00011d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D20 11936 bytes
SHA-256: 5b537191ce3c6038b25919391164eb409f8ddf92d9b1d8949f1997a59ca69bb5
font_02_sfnt_off0001460f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1460F 16112 bytes
SHA-256: a4790eb4f6d4154bf27b37f3c17bff3199b0e620de062e7f5c148da0cd1c657b
font_03_sfnt_off00015ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AE2 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e