Malicious PDF — malware analysis report

Static analysis result for SHA-256 461ad55f8eb153af…

MALICIOUS

PDF

86.9 KB Created: 2021-03-22 03:18:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f04725a29c7916ae1a67a7c06e2263f SHA-1: 8a1eb6bd08348ec491a20f7b10fec6367d08b804 SHA-256: 461ad55f8eb153af910ab85fc5c4de04f34311c8606ac96d7a74e81f1b89bd8d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings reveal it contains a large number of external links, forming a link farm, with one prominent URL pointing to a potential software download. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to malicious or unwanted content, likely for SEO manipulation or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/wix?keyword=samsung+smart+switch+apk+2018
    • https://sevezumu.weebly.com/uploads/1/3/2/7/132710575/liban.pdf
    • https://cdn.sqhk.co/datolabevev/ghhiDif/slingo_classic_download_free.pdf
    • https://cdn.sqhk.co/bodegife/hj9ighj/63103154040.pdf
    • http://microbestdigitalmeter.xyz/uchiage_hanabi_sheet_music_violinh1c31.pdf
    • http://agencymedia-ig.com/velocity_and_acceleration_worksheet_cstephenmurraykht8w.pdf
    • https://cdn.sqhk.co/guzufaseba/e8ShiHM/vitamin_c_supplements_amazon.pdf
    • http://jadebey-x.com/93389339001zp2gh.pdf
    • http://albl.ru/2500_usd_to_cad_dollarsl9y6u.pdf
    • https://fivujage.weebly.com/uploads/1/3/4/3/134316273/tapil.pdf
    • http://homeolimp.com/burnham_alpine_boiler_replacement_partszq3ck.pdf
    • https://fenutirixe.weebly.com/uploads/1/3/4/6/134640366/vaxofudebunowede.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lebejos/acdsee_photo_manager_12_full_version.pdf
    • https://s3.amazonaws.com/jipowumat/the_crown_season_1_cast_margaret.pdf
    • https://s3.amazonaws.com/fedojigudaj/nadaguides_used_car_value.pdf
    • https://uploads.strikinglycdn.com/files/cbdabea9-e523-492a-9cd3-caab64b3070b/japozatiwazuliwutumogufut.pdf
    • https://s3.amazonaws.com/wurivuve/pomazovumaxijilijafirarun.pdf
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_2172b1e478ec42e28d4dc048e08a4d29.pdf?index=true
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_0cdc296c3d424d1e8c6e01cfbb0341a0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/78b175bf-033d-4d30-8567-822d034bd009/how_much_does_a_trane_unit_cost.pdf
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_9325887446a041938ad05d96758aa148.pdf?index=true
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_19a08ab9e37f4c17b994bd0f1c375ac0.pdf?index=true
    • https://s3.amazonaws.com/votubukaxogilix/havoc_brothers_album_songs_free_starmusiq.pdf
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_2173aafcf30944b5addfd17a180647d8.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f028.bin
1ebfadf7ffebdddb20c92f968a28fc1343420d3a9476db371b30cc5f15cd3906		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF028 6096 bytes
font_01_sfnt_off000104d5.bin
673e17f9d7daf85265bed6cc87984335a144cc821967ed8baf0b20c6d72bb6f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104D5 15928 bytes
font_02_sfnt_off00013652.bin
842d8d2e4e7c5759731deaa1e45dccef8c07b1245d382ee342e7430a99c1e6a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13652 16268 bytes

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