Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f69079ef8eaec3a…

MALICIOUS

PDF

92.0 KB Created: 2021-03-16 06:14:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aca09ab6bd43d0131772431d0e707915 SHA-1: 44678815e97182e5fed819ca00208fa3b0601ad0 SHA-256: 1f69079ef8eaec3ab14bf465b6ec0b627b8ae10e3d7e8fad6e08265d527838b1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms and phishing sites. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, with one pointing to 'https://mezovuduw.ru/wix?keyword=wave+worksheet+part+1'. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware distribution via the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/wix?keyword=wave+worksheet+part+1
    • http://ronifibofizet.medianewsonline.com/tapanixinesigipirarizag.pdf
    • https://cdn.sqhk.co/pozigafo/ic1q3jd/59020345004.pdf
    • https://cdn-cms.f-static.net/uploads/4383703/normal_600ef7d03a572.pdf
    • https://cdn-cms.f-static.net/uploads/4369179/normal_60502856019a6.pdf
    • http://tevutubiwij.getenjoyment.net/68994621910.pdf
    • https://cdn.sqhk.co/dowusutitozi/irhaMhh/skyrim_dragon_scroll_puzzle.pdf
    • https://cdn-cms.f-static.net/uploads/4482399/normal_604e1aa74910c.pdf
    • http://sutovuresas.mygamesonline.org/should_a_single_man_buy_a_house.pdf
    • https://cdn.sqhk.co/fosulavale/iTjioid/binaural_beats_meditation_free.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zabejuvijolu/8017594200.pdf
    • https://uploads.strikinglycdn.com/files/a3e2b55f-ce90-467e-937e-eccc59a7d0a2/dmc_embroidery_floss_color_chart_printable.pdf
    • https://uploads.strikinglycdn.com/files/7a568222-3b71-4815-a34e-2e0ce86e2fd2/geralds_game_book_quotes.pdf
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_33445414a12e4d27a7600c81a3e816f6.pdf?index=true
    • https://4fcc26ae-a476-48f2-98aa-cdc5c12f4544.filesusr.com/ugd/32d0e1_d20a88ca7fd441798ce5345b4eb1dc35.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5a302254-4dce-4a95-8bc7-7f2a506b12f7/84734472157.pdf
    • https://s3.amazonaws.com/tidigudetefumof/traffic_report_5_freeway_san_diego.pdf
    • https://uploads.strikinglycdn.com/files/792c5960-c4e5-42e8-ab6f-d5743b920db4/shell_script_example_with_for_loop.pdf
    • https://uploads.strikinglycdn.com/files/dfadf6c5-2e71-4876-917b-5e6f608c6f69/materia_y_energa_ejemplos.pdf
    • https://s3.amazonaws.com/varolexexus/succession_planning_template_family_business.pdf
    • https://s3.amazonaws.com/faduxodiwo/bk_all_songs.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001041d.bin
d69fdb81d3839397f42543e987a9d34380173829329b7a56e9a225e29624cc14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1041D 11600 bytes
font_01_sfnt_off000129d3.bin
c79b8e706baceed40583701fac5198c7b959c7e20480e0b07226dafcaa143872		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129D3 5156 bytes
font_02_sfnt_off00013b78.bin
db2af4851907d0b588b4a61fdd0df7b3ca9bee0cb4cb01069ebe93cffa6aeca5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B78 11712 bytes

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