Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ca033c86926246…

MALICIOUS

PDF

120.5 KB Created: 2021-03-24 16:29:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 058f363df5d38e73512a56e63628c676 SHA-1: 85313ffe1acca608c3ffa9447a6122de8d365af2 SHA-256: 33ca033c86926246113394d8de16ab7e624d4ae5cd397a197062fe9f2347c01b
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm designed to host malicious content. The presence of a 'download' button lure and ClamAV detection further supports a malicious intent. The primary URL, 'https://resalured.ru/wix?keyword=asus+battery+health+charging+download+windows', is likely used to redirect users to a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://resalured.ru/wix?keyword=asus+battery+health+charging+download+windows PDF link annotation
    • https://cdn.sqhk.co/vivepovugeli/5mheifQ/53964085837.pdfIn PDF document text
    • https://cdn.sqhk.co/vumorumuvogi/yiehgkG/disneyland_hotel_reservations_star_wars.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/heihJjc/sobre_aneuploidias_como_so_formadas.pdfIn PDF document text
    • https://cdn.sqhk.co/redexisa/evrtl59/hydronic_radiant_floor_heating_diy.pdfIn PDF document text
    • https://cdn.sqhk.co/bamosabubesi/hfOjbie/57373697119.pdfIn PDF document text
    • https://cdn.sqhk.co/sizebadit/7jagcxk/famiwikulafokoravupexu.pdfIn PDF document text
    • http://suraneb.scienceontheweb.net/alleen_op_de_wereld_boek.pdfIn PDF document text
    • https://cdn.sqhk.co/gukugifixija/oicknhc/bertram_fiddle_episode_1_walkthrough.pdfIn PDF document text
    • https://cdn.sqhk.co/vilosezuj/icifzjf/lose_weight_story_game.pdfIn PDF document text
    • https://wepejusekubikur.weebly.com/uploads/1/3/4/4/134441987/xixawerekige.pdfIn PDF document text
    • https://cdn.sqhk.co/bamazaludez/euwj4xo/smash_burgers_los_angeles.pdfIn PDF document text
    • https://wazajodowefode.weebly.com/uploads/1/3/4/0/134017502/fe042baf99.pdfIn PDF document text
    • https://www.ringtonex.com/mp3/2020/hello-moto.mp3In PDF document text
    • https://www.tonehIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zabukek.rf.gd/alimentos_y_bebidas_con_cafeina.pdfIn PDF document text
    • http://gizixaxeviduf.myartsonline.com/40878320302.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9961447f-f60c-4649-8004-d202605a151f/flysky_8_channel_transmitter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5f9271f-aff2-4167-afe6-45d5b9f80eaf/6908259933.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3e847f5-07dd-444a-832b-65f9988ec032/sahih_bukhari_hadees_in_urdu_download.pdfIn PDF document text
    • http://maretubozewugi.myartsonline.com/97985776259.pdfIn PDF document text
    • http://sivumokevidosib.rf.gd/windows_10_64_bit_setup.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000e895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE895 6440 bytes
SHA-256: 705377623a4c4344e02470fedf876d1ed6f0c7c0eac322cafb15afc9430d14bf
font_01_sfnt_off0000f859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF859 46040 bytes
SHA-256: 5f3f052a2831e2079cc8547f777d52ee0780f1eda1c0e9403a03280a67c60ca2
font_02_sfnt_off00018507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18507 5524 bytes
SHA-256: 801dcf185773a774e195ab3e1ed99f6c40c479a2cb3c42208f929eb84aada2cb
font_03_sfnt_off000197de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197DE 11180 bytes
SHA-256: d12cf532b7ff6a6b61665c43b8b9401cc62aff5c74f4c836249b96bb5858ae0c
font_04_sfnt_off0001bdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BDC6 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf

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