Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4623d2964388779…

MALICIOUS

PDF

73.5 KB Created: 2021-03-10 05:43:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2b522b708a3890497a7a5fd496b7cb34 SHA-1: 92ef0c105db244fc64e8d792b96bd04cd1e74ec3 SHA-256: d4623d29643887791b478185f4874b80a8b0291c7fb25cebe2cbe23a0374fd67
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/123?utm_term=dream+league+soccer+2020++for+pc PDF link annotation
    • http://lizowaw.scienceontheweb.net/fisher_price_toy_garage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388416/normal_6023eb2a0e3d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454971/normal_5fc6d03505295.pdfIn PDF document text
    • http://batmbatm.ru/6172590231990fn.pdfIn PDF document text
    • http://wide-mean.top/who_is_george_in_go_ask_alice1s32y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480756/normal_5fcecf815666c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479674/normal_5fe636e29db73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465274/normal_60467153c8bd0.pdfIn PDF document text
    • http://center-san.ru/5_criteria_for_evaluating_sourcespzoen.pdfIn PDF document text
    • http://all-casino.xyz/lujadesojigewtl1c.pdfIn PDF document text
    • http://iqecoportal.ru/how_to_use_a_speed_square_to_cut_rafterszz09x.pdfIn PDF document text
    • http://xoxosedefoxadu.mygamesonline.org/nordictrack_commercial_1750_price_philippines.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/divelikubapiwaj/50871959356.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/how_to_turn_casual_dating_into_a_serious_relationship.pdfIn PDF document text
    • https://aca292c6-a3ee-4c96-b4c9-db15c8eca1b9.filesusr.com/ugd/cd1d52_c7aaf412d3fc456db398037b89dc9ed6.pdf?index=trueIn PDF document text
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_29253577be4b4b71b4943f0ad0ea32dd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/salade/42021239548.pdfIn PDF document text
    • http://gozenabuzixi.onlinewebshop.net/zufuxaxaj.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_off0000e34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34B 5608 bytes
SHA-256: e63c6d558fd0386ad9e66f984e2814cdb4a4a9be9948a814c2e9488679b65c63
font_01_sfnt_off0000f653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF653 10104 bytes
SHA-256: 668e261392fc7bf191b64287ecc0e63aeff2c5fd489e4af8cdcf901f3e0ee68b

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