Malicious PDF — malware analysis report

Static analysis result for SHA-256 abfbe91eafb0e1dc…

MALICIOUS

PDF

104.1 KB Created: 2021-01-18 20:27:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: aa5da2e86beff0c95f5e4432798e89ba SHA-1: eea97ed95159fafc84db0460f50f197ab160a68c SHA-256: abfbe91eafb0e1dccf6dd148c1c93b793c2deb51aef92a7c745a80d6bbbedf29
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection and ML classifier further support the malicious nature of the file. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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.
  • 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://maypoin.ru/123?utm_term=fast+pixel+bullet+hacked PDF link annotation
    • https://gugekeki.weebly.com/uploads/1/3/4/3/134374678/namilozubujubaromej.pdfIn PDF document text
    • https://cdn.sqhk.co/gobuwovuv/ijcjaij/shadow_fight_2_special_edition_mod_apk_mody.pdfIn PDF document text
    • https://xusalifur.weebly.com/uploads/1/3/4/1/134131705/zuzotoretetetat.pdfIn PDF document text
    • http://jixaravaxagisuf.22web.org/barrack_o_karma.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/aczifij/clone_space_32bit_support_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/dogutadova/RjgAU97/plants_vs_zombies_movie_download.pdfIn PDF document text
    • https://cdn.sqhk.co/rewakevutel/d7Nzibd/spirit_halloween_coupon_25_off.pdfIn PDF document text
    • https://cdn.sqhk.co/bolukawet/jfhdqip/14623874520.pdfIn PDF document text
    • https://vufevilasok.weebly.com/uploads/1/3/4/3/134314299/sutodegaduju_jisetabarikuzi.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/nademopor/aankh_maare_hd_video.pdfIn PDF document text
    • http://xovijoj.epizy.com/bulk_carrier_practice_second_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/bombay_tamil_movie_songs_320kbps.pdfIn PDF document text
    • http://gejevebo.epizy.com/aithey_aa_bharat_song.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF78 12688 bytes
SHA-256: f344958398135a9d9b3b60844cc8cabcbee466f0476a3464d7e00abddba74081
font_01_sfnt_off00012874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12874 5292 bytes
SHA-256: 20e57cfe99a6c3514cb16be6d0348fbe2324e1fba19c71ada39bf9619a559dbf
font_02_sfnt_off00013a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A65 5856 bytes
SHA-256: 15e5132bc461dfda6e8eb1ff40f5e6a3390d1b54da7a593f95671bb2d3c92ecf
font_03_sfnt_off00014f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F82 11360 bytes
SHA-256: 6515280ef5ec390ece9e01ce4eaa535bd0256c93e28138539a1d0f479df79a80
font_04_sfnt_off00017691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17691 17428 bytes
SHA-256: afaf10d0a6d821756bc964685a65608212a31731ca0bba37f67e0f4bd87e1505

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