Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7871d88bb4349d9…

MALICIOUS

PDF

80.7 KB Created: 2021-04-07 10:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a71697b6a2164cdf9ca75265a35e3748 SHA-1: eea0cb75e4ba2825a4515d159daed7764aacae40 SHA-256: a7871d88bb4349d9f1f349f9e2f5d2541fa24fd2d1cb6a1a002588564374439f
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are disguised as legitimate content, such as manuals. The heuristic PDF_SEO_LINK_FARM indicates a deliberate attempt to create a link farm. The presence of a malicious URL and ClamAV detection further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and link farm suggest it's designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://midufefew.ru/strik?utm_term=delonghi+dehumidifier+manual+r410a PDF link annotation
    • https://gusumumonabol.weebly.com/uploads/1/3/0/7/130775475/rapalab.pdfIn PDF document text
    • http://muzhskoizhurnal.ru/macbeth_play_line_count702xr.pdfIn PDF document text
    • https://fezagigix.weebly.com/uploads/1/3/0/8/130813643/6583acab5fa30.pdfIn PDF document text
    • https://labajamipudoxa.weebly.com/uploads/1/3/5/3/135399896/juvenap.pdfIn PDF document text
    • https://livubefelamujir.weebly.com/uploads/1/3/4/8/134899239/1281126.pdfIn PDF document text
    • https://juzolafer.weebly.com/uploads/1/3/4/3/134382033/rifurasidaviruvab.pdfIn PDF document text
    • http://geosen.net/90389445277he9eq.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://s3.amazonaws.com/pubopelej/limidog.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/akasam_ammayaithe_hd_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/23316153447.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a1de4de-d775-4bf6-a493-a2da297c3538/my_son_my_executioner_theme.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/how_to_get_neutral_in_transformer.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/every_living_thing_james_herriot.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/25198256429.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b52ccf58-f130-454e-8784-1f1e84f1b1f0/american_literature_textbook_online.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/connector_iphone_to_android.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/calculate_mean_median_mode_standard_deviation_variance_in_python_using_numpy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02b9e562-20e5-41b2-a9ff-a8cb887a75d1/experience_human_development_12th_edition_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/why_the_magna_carta_is_so_important.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dd80aad-092b-48eb-b145-34847ca6a4cc/arkansas_learners_permit_driving_rules.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_off0000edf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF9 5224 bytes
SHA-256: 3695a71c426a18d04e7bc6478fe957826a4154626642245355c4776b251e4be9
font_01_sfnt_off0000ff92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF92 11036 bytes
SHA-256: 54c831a81d7656d528bd3888bdf722bafe24c303e19181d5bb465ea98f0593c6
font_02_sfnt_off00012534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12534 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

Open this report in the interactive analyzer, or submit your own file for analysis.