Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a12945990d99ddf…

MALICIOUS

PDF

74.8 KB Created: 2021-05-16 07:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: eb1d19b16834168f9ed9cbfac551e621 SHA-1: 17e1f99f76cf6fff8825a8ce3d16327beeada470 SHA-256: 1a12945990d99ddfdcb565d15e28fef3b657165eaa3a0acc16e391527c03f981
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, and it contains a significant number of embedded URLs. One critical heuristic indicates it's a PDF redirector link pointing to 'https://yafferge.ru/wb?keyword=serta%20motion%20essentials%20iii%20adjustable%20base%20headboard%20brackets', suggesting a phishing or scam attempt. Another heuristic flags it as a PDF SEO link farm, with 30 external links, many hosted on disposable domains, indicating a potential attempt to manipulate search engine results or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://yafferge.ru/wb?keyword=serta%20motion%20essentials%20iii%20adjustable%20base%20headboard%20brackets In PDF document text
    • http://rineset.xyz/first_day_of_school_activities_6th_gradekfhqm.pdfIn PDF document text
    • http://cesaregaspari.com/64x32bjsm0.pdfIn PDF document text
    • http://mx50off.pro/canned_heat_on_the_road_again_harmonica_tabu7cyu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/libosokune/73792484208.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe41376f-c51b-46af-a8fb-2abcd612d522/how_to_get_power_of_attorney_over_a_parent_in_florida.pdfIn PDF document text
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_0c62b78eed5842ccb16ec96012318054.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/58abd703-6067-4744-beef-ac58b5d7a069/resumen_del_capitulo_1_y_2_del_libro_etica_para_amador.pdfIn PDF document text
    • http://jarexuvi.epizy.com/7554842772.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8bab233-7239-47a4-adbc-5c409c43028d/onkyo_tx_sr608.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7bc8c83-5bf1-4826-a088-9c1e261771c0/bobcat_badge_placement_on_cub_scout_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/2015_amc_10b.pdfIn PDF document text
    • http://xoxigibutu.epizy.com/introduction_to_public_administration_and_management.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dce547f6-d5a1-4b3c-8e4c-dc22209bf0af/90015901665.pdfIn PDF document text
    • http://fuzadakeju.epizy.com/bcd_to_7_segment_decoder_ic_datasheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad3ee000-dfa4-46ad-99ee-7b8865abf7b8/canon_mg3520_printer.pdfIn PDF document text
    • https://s3.amazonaws.com/borokegujuzero/35638331041.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/char_broil_performance_series.pdfIn PDF document text
    • https://57eba762-b826-4879-8d7a-7f480aba2934.filesusr.com/ugd/e89c2b_7581b726780e4bb4aee1423e00848bd8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/timeziso/fikilorovotuvavulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8770b8fc-1761-4af9-bce3-ef0e495d9f90/what_is_a_wake_after_death.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08C 5560 bytes
SHA-256: f4a053fe38da2017f887d6c2e4da51359539449cd5bfa5885c78d62bcf8ca9c8
font_01_sfnt_off0000f348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF348 12200 bytes
SHA-256: e20982c4fb1730ef92315c9609bbabcc5cbfc682ad5ddb3591fe9b5cfc18f1c5

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