Malicious PDF — malware analysis report

Static analysis result for SHA-256 983c946fd04cf8a2…

MALICIOUS

PDF

79.9 KB Created: 2021-03-17 20:16:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 357f893f60e03a49c3a6fb06f44c419f SHA-1: 20e343e1a59f518d0381d2bedd9c1959438fd74e SHA-256: 983c946fd04cf8a209631349c25fd66eb5b96573e1d6f26f7d67570c2b9b40f3
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or redirection scheme. The document body, though heavily obfuscated, contains text related to an RCA home theater system manual, likely serving as a lure to trick users into clicking malicious links.

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://zajinet.ru/strik?utm_term=rca+home+theater+system+rt2380bk+manual PDF link annotation
    • http://roxobupupop.22web.org/bootstrap_form_input_validation.pdfIn PDF document text
    • https://wejumarokurefa.weebly.com/uploads/1/3/0/7/130776247/1622924.pdfIn PDF document text
    • http://gakemuxuk.22web.org/panowute.pdfIn PDF document text
    • https://zuvimetuna.weebly.com/uploads/1/3/5/3/135304981/tosanatofim-bifipu.pdfIn PDF document text
    • https://kifezitiwiwafu.weebly.com/uploads/1/3/5/4/135400929/boweluwozigamezizes.pdfIn PDF document text
    • https://cdn.sqhk.co/wadupaxi/gg2ibhc/rupaul_vegas_vh1_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/fusozuwalas/ji6ehfp/reversible_sleeper_sectional_with_ottoman.pdfIn PDF document text
    • https://cdn.sqhk.co/xivijela/cO6rs4I/34110802795.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://uploads.strikinglycdn.com/files/d59e4e19-cab3-46d8-a2ec-c4855a76619f/pejokejurakedad.pdfIn PDF document text
    • http://kapigazezej.epizy.com/limits_at_negative_infinity_of_quotients_with_square_roots.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/zuxonizenokateten.pdfIn PDF document text
    • http://kuwademepekipil.epizy.com/contax_g_lens_on_fuji_x.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b7fea81-4ab1-460b-a01a-f49212d713ed/41895448780.pdfIn PDF document text
    • http://woloripovopakop.rf.gd/how_to_pair_philips_universal_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2de9d1f-5953-4555-9bcb-cae2ac32c97c/meaning_of_non_verbal_communication_and_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/anjana_anjani_movie_all_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/toto_africa_piano_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31fc6fe1-7d02-43db-b9ef-9748eaeb7593/28705078736.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/givujub.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_off0000ec2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2B 5820 bytes
SHA-256: 872d01641231e02d86885afb5c87d3349c601417e0380245d4d7f54b0f9cbdc0
font_01_sfnt_off0000ffcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCC 10840 bytes
SHA-256: 65652530d29602e778d84228997cfa3d5896175242fa51c8acecf1a2b495fd94
font_02_sfnt_off00012461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12461 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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