Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2cf78f4103895d5…

MALICIOUS

PDF

87.6 KB Created: 2021-01-18 02:11:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: cdc6186ec4493101a877e13f28cdf752 SHA-1: 3a305ba5a50afacabdf20a89eb1818a47613fd92 SHA-256: b2cf78f4103895d55108197e63caefa240812a8a8aba37760966d0b8e6707cf6
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for brand-impersonation credential phishing targeting Amazon. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The primary lure appears to be a fake Amazon-themed offer, directing users to click on embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://tariwina.weebly.com/uploads/1/3/0/7/130739483/8017468.pdf.
  • 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://trafffe.ru/123?utm_term=bismarck+high+school+supply+list PDF link annotation
    • https://tariwina.weebly.com/uploads/1/3/0/7/130739483/8017468.pdfIn PDF document text
    • https://cdn.sqhk.co/xobakidanav/7gdcmTQ/t_mobile_black_friday_deals_on_iphones.pdfIn PDF document text
    • https://cdn.sqhk.co/rowavarop/eJihjib/rifunexoxumewod.pdfIn PDF document text
    • https://nalodewemutut.weebly.com/uploads/1/3/1/1/131164475/9329164.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/cwghDgi/drop_stack_ball_fall_helix_blast_game_download.pdfIn PDF document text
    • https://site-1242304.mozfiles.com/files/1242304/chicken_pounds_to_cups.pdfIn PDF document text
    • https://walijogopabo.weebly.com/uploads/1/3/0/7/130776167/zital.pdfIn PDF document text
    • https://kerumesuni.weebly.com/uploads/1/3/4/1/134131613/542ea96.pdfIn PDF document text
    • https://giretalude.weebly.com/uploads/1/3/4/6/134677333/faniwuzapunusurefob.pdfIn PDF document text
    • https://site-1175273.mozfiles.com/files/1175273/soziologische_aufklrung_1.pdfIn PDF document text
    • https://fuvapevamasazu.weebly.com/uploads/1/3/4/5/134507747/duzogej.pdfIn PDF document text
    • https://ragesetenavuxom.weebly.com/uploads/1/3/1/6/131606186/a2c6a056996be2.pdfIn PDF document text
    • https://segapokepex.weebly.com/uploads/1/3/4/6/134649200/1668559.pdfIn PDF document text
    • https://cdn.sqhk.co/xijisejes/17Ohcje/vovafowosu.pdfIn PDF document text
    • https://zulatikuwa.weebly.com/uploads/1/3/0/7/130776211/3173412.pdfIn PDF document text
    • https://cdn.sqhk.co/gazejuruni/hayoGih/webekokujofiruvunomof.pdfIn PDF document text
    • https://tezifotunojoke.weebly.com/uploads/1/3/0/7/130776805/zuweveribasofew_jaxitexinawufi_jugovedazena.pdfIn PDF document text
    • https://cdn.sqhk.co/sanevujaguda/Maggig1/25983872516.pdfIn PDF document text
    • https://cdn.sqhk.co/firumefetev/gcbidwt/74462318269.pdfIn PDF document text
    • https://pobafegesodagiz.weebly.com/uploads/1/3/4/3/134305133/vaforow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012332.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12332 26168 bytes
SHA-256: b1656e92a6e8c926080608dbcb443559c4244ad546d78d8da7289521000a8cf5
font_00_sfnt_off0000ea51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA51 5560 bytes
SHA-256: bb16cf6087527476c3b63a59d5aa81126e9ee9e05574e701bdb81f8bbf8079de
font_01_sfnt_off0000fd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1A 11224 bytes
SHA-256: 71326f3be4619a385a922eb75d6b96a80bb25c477a0eba76b891f8f4c165ee9f

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