Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05d97e37f580a7d…

MALICIOUS

PDF

80.4 KB Created: 2021-03-23 10:14:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f918dbe4e9ee9ea75012d1927d836ace SHA-1: 40b3567a70bbacfea27b98b369f5d8e814ebb00d SHA-256: a05d97e37f580a7d41bbda6c634322f006795851d9572ca39a749a6bf2130f4c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, with one prominent URL pointing to a domain associated with link farming and disposable hosting, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and URL analysis point to a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://seumenha.ru/wix?keyword=unity+center+for+urban+technologies PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466364/normal_600d1436d2528.pdfIn PDF document text
    • https://cdn.sqhk.co/tefupudoma/feajgls/79737476461.pdfIn PDF document text
    • http://vannabanyavsedela.xyz/lafafakajaraveguloveok90.pdfIn PDF document text
    • https://cdn.sqhk.co/fezivabuja/cz4p1hi/10188933907.pdfIn PDF document text
    • http://circleshtang.xyz/f_distribution_table_0.005jtvr3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386347/normal_5fea1179e44a8.pdfIn PDF document text
    • http://makeyourself.xyz/80662435968vpsf6.pdfIn PDF document text
    • https://cdn.sqhk.co/tolononof/fhddieJ/download_dungeon_madness_2_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/lapefuxolu/9iie1jg/vatinoremetisisiwez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387918/normal_5fcc5563d308f.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/jrghaIj/csr_racing_2_hack_discord.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
    • https://156bb51f-0b62-477f-88ca-8620af00812b.filesusr.com/ugd/e3ff21_30b7efcf9a904557923cb755c82c8ef2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/vepolunaxadiju.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/coherence_and_cohesion_exercises_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4884aa8b-9428-460a-aaf3-59ed27119a23/how_long_is_the_average_person_homeless.pdfIn PDF document text
    • https://d5aacb37-8766-4234-9cc8-c2ec3b911aba.filesusr.com/ugd/1e723b_dc0c247b774446faa990bb7dd30eecec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/how_to_reset_kitchenaid_refrigerator.pdfIn PDF document text
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_e0d4cd86bdeb4227a2d6a1fb39ba5ba0.pdf?index=trueIn PDF document text
    • https://cd5075e9-4951-46bd-8d13-413fdd501c9b.filesusr.com/ugd/eceaf1_0c187d96318744a6b8b708b769b4550e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f84f4bb5-1f71-487e-8335-91fd859f9185/how_do_i_pair_my_onn_headphones.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9F 5256 bytes
SHA-256: d971bd7bd293dedff54deadf66ff735296dfa05c2b5ac570c8b028a79d6c6678
font_01_sfnt_off0000fe7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7D 11572 bytes
SHA-256: 642d61e7e092a2ebfc50b7adac706da93a9dce669cb3393cc0fc59d98fcf840c
font_02_sfnt_off000125ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EE 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e