Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b8e4fab3d1e81d…

MALICIOUS

PDF

79.4 KB Created: 2021-03-04 18:47:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9cc3acfe4e68431fabe448e1b3760c51 SHA-1: 9f6d1ed87802cd598a90829626cb1a8a37d8fe68 SHA-256: 35b8e4fab3d1e81d9c54bddd7eb52a40329a6b844f4a5c711439a65806f91e3a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. The primary URL points to a site that appears to be related to SEO content, suggesting a deceptive lure. ClamAV detection and ML classification further indicate malicious intent, likely related to phishing or distributing further malicious content via the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://golowaki.ru/123?utm_term=batman+the+dark+knight+returns+comic+book+summary
    • http://2020coupons.info/42905339794qu67v.pdf
    • http://bluebadgeapproval.com/our_god_reigns_chordskeiex.pdf
    • https://cdn.sqhk.co/javeduner/hbgfBig/slide_away_oasis_acoustic_lesson.pdf
    • https://cdn.sqhk.co/dudugetogi/XPqggic/34542796841.pdf
    • https://cdn.sqhk.co/savaketiju/0rhbnhg/86256520117.pdf
    • https://cdn.sqhk.co/dagozuwemep/4Xgip4k/navy_field_medical_service_technician.pdf
    • https://cdn.sqhk.co/kagumuzom/KSLB4gj/37276768340.pdf
    • https://cdn.sqhk.co/nubenirosife/6PgcTgf/gukunotuzibar.pdf
    • https://cdn.sqhk.co/wanaxowuwot/jcWvgST/drop_it_low_kat_deluna_indir.pdf
    • https://cdn.sqhk.co/kujotukil/LrPiFja/gafidur.pdf
    • http://gk-kuban.ru/air_force_semi_formal_dress_white_shirt63uxz.pdf
    • http://boomerangoo.site/traxxas_stampede_2wd_brushless_system7scfc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://391e4f24-9fc9-4707-ac06-338edcd9f959.filesusr.com/ugd/110ef3_519171bcfa2f4fc781ebc04a7099d4b5.pdf?index=true
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_0e5efa8de4234b288008e90790c06c8e.pdf?index=true
    • https://564fd4a8-0e6d-4f97-813a-a14a70c45316.filesusr.com/ugd/f90d28_ec3586df19804943b48a3d1978d8d072.pdf?index=true
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_e46955de1f9348c9bdd9f6c41eaa635e.pdf?index=true
    • https://6762652a-e869-40f3-960d-1446d4066230.filesusr.com/ugd/55e6b1_af085a0563e745c2b082e49f62345a70.pdf?index=true
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_ad3d14b6bd684ba78d20eecf70542056.pdf?index=true
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_00406a937a134225a743fa93cadf0238.pdf?index=true
    • https://uploads.strikinglycdn.com/files/95e674b7-0bc1-403e-92ad-2ba8f3db917b/samsung_smart_tv_55_inch_4k_price_in_india.pdf
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_93a6b42ce02c4f6996b73169f50ea132.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f057fbc0-9c8d-47b2-878b-4253081712e8/pomaxubilukudumepelagob.pdf
    • https://uploads.strikinglycdn.com/files/bc7bf65f-6f2f-441e-9351-dd4007aafdb6/the_handmaids_tale_by_margaret_atwood_sparknotes.pdf
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_1657797e9f8d4b23ada82c8a7429c7e0.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f80d.bin
d07bd4b8d34677bdb207da23c911e88f51af4485b53153cf4c595dc8d4ae4a16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF80D 5676 bytes
font_01_sfnt_off00010b42.bin
3fb836d24a756a787cf59b112f155c0d6e0013738ae8672545975a589eb61079		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B42 10724 bytes

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