Malicious PDF — malware analysis report

Static analysis result for SHA-256 277471a2406fed0b…

MALICIOUS

PDF

74.8 KB Created: 2021-03-14 16:44:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 5ca3916a3cedd91f49c820e4eeb9c3d8 SHA-1: 6b919b8bd956d9167e710eb730e45e308f9965a9 SHA-256: 277471a2406fed0bc2ed84d05f31028a008ece4957ff56e4be19a493d6e71ab9
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, with at least one pointing to a known malicious redirector at `crophysi.ru`. The document body is heavily obfuscated, but the presence of embedded URLs and the overall heuristic findings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=algebra+1b+semester+exam+review+answers In PDF document text
    • https://cdn.sqhk.co/gosuzufus/AhcYido/rubawevegimutiguzuxavol.pdfIn PDF document text
    • https://cdn.sqhk.co/fenogate/ajaEgj0/51468816244.pdfIn PDF document text
    • https://cdn.sqhk.co/kigimole/gdvhb9K/elements_financial_auto_loan_payment.pdfIn PDF document text
    • https://cdn.sqhk.co/wogirujut/ggW79jO/fifilenabolipabufiwupiwus.pdfIn PDF document text
    • http://kizidotiz.iblogger.org/21242698632.pdfIn PDF document text
    • https://cdn.sqhk.co/mafowixodi/gAjiiiN/bugajuvepit.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://suborox.epizy.com/tigebukonidawemedu.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/52090309364.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18201acb-f418-4cac-a3a5-d43de0a9b11a/cub_cadet_ltx1042_deck_parts_diagram.pdfIn PDF document text
    • https://a80c0318-1640-4d50-a016-df037fc402b9.filesusr.com/ugd/895bef_e71ba8bb365f48a1a5253b9184f5151f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ec6f7e6-0d58-471e-8b9d-24360bf363cf/how_do_i_reset_my_wildgame_camera.pdfIn PDF document text
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_d7cc50d3a0cd46c4927d270a348cd595.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/490c6eef-e0c4-4392-ad93-a282c32d1dfe/gusugovama.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/diy_circular_saw_guide_rail.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ae121a1-cbc0-4fc8-8376-226485012c88/lowonewemakudikowo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b626c9d5-33cf-42e5-82b1-222784f29939/oracle_12c_download_32_bit_linux.pdfIn PDF document text
    • http://nopetavu.rf.gd/10353313324.pdfIn PDF document text
    • https://167c8e7b-8160-49a2-a88e-f26749d647c8.filesusr.com/ugd/1ad47d_9d265afcbfa9463584cb66ff7ee5bfae.pdf?index=trueIn PDF document text
    • http://gofirog.epizy.com/guided_meditation_sleep_asmr.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/faxexigevixijijiruxorew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec5f269c-ae2d-49f5-b1e3-f13ef84e62fd/why_is_my_chamberlain_garage_door_opener_beeping.pdfIn PDF document text
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_a3a634645a2841bcb186d1235a80f975.pdf?index=trueIn PDF document text
    • http://gixomawijal.rf.gd/omron_hj-321_tri-axis_pedometer.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_off0000dbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCA 5084 bytes
SHA-256: a7e46f36adc3cf320310674734bf2a6abc0f23d42c8609ecdeb94394cf440a8a
font_01_sfnt_off0000ed0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0D 10008 bytes
SHA-256: 569c0ec0cf9dfd3f7ad0f019e970d521d71268d6ea5d0a8c7cbb44c842fbfb0f
font_02_sfnt_off00010f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F00 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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